The bus driver often complains about chewing gum found under passenger seats because it is ____ and very hard to remove.

Jesse is a talented model. He can easily adopt an elegant ____ for a camera shoot.

In order to draw her family tree, Mary tried to trace her ____ back to their arrival in North America.

Upon the super typhoon warning, Nancy rushed to the supermarket—only to find the shelves almost ______ and the stock nearly gone.

Even though Jack said “Sorry!” to me in person, I did not feel any ____ in his apology.

My grandfather has astonishing powers of ____. He can still vividly describe his first day at school as a child.

Recent research has found lots of evidence to ____ the drug company’s claims about its “miracle” tablets for curing cancer.

Corrupt officials and misguided policies have ____ the country’s economy and burdened its people with enormous foreign debts.

As a record number of fans showed up for the baseball final, the highways around the stadium were ____ with traffic all day.

Studies show that the ____ unbiased media are in fact often deeply influenced by political ideology.

$~~~~$ In certain forests, when you look up you will see a network of cracks formed by gaps between the outermost edges of tree branches. It looks like a precisely engineered jigsaw puzzle, each branch growing just perfectly so it almost, 11, touches the neighboring tree. This beautiful phenomenon is called crown shyness.
$~~~~$ Scientists have been discussing crown shyness since the 1920s, proposing 12 explanations for the phenomenon. Some researchers point out that as trees often grow close together, treetops can easily collide and break when swayed by the wind. In order to protect their branches from breakage, trees maintain “shyness gaps”—spaces large enough to prevent them from touching their neighbors.
$~~~~$ Other scientists suggest that plants, like animals, 13 resources—nutrients, water, space, and light. In forested areas with thick tree crowns, there is intense struggle for these resources. Gaps in the treetops resulting from crown shyness may allow trees to increase their 14 light and enhance photosynthesis. Additionally, by having branches that do not touch those of their neighbors, trees may be able to limit the spread of leaf-eating insects, and potentially also the transmission of diseases from tree to tree. 15 decades of investigation, there is no consensus on exactly what causes the beautiful and mysterious phenomenon of crown shyness.

$~~~~$Gravity has been at the top of the science agenda since the start of Mars missions. In the earlier days of space travel, scientists tried to overcome the force of gravity so that a rocket could shoot 16 Earth’s pull in order to land humans on the moon. Today, they are more interested in how reduced gravity affects the astronauts’ 17 condition.
$~~~~$Our bodies have evolved to exist within Earth’s gravity (1 g), not in the weightlessness of space (0 g) or the microgravity of Mars (0.3 g). When on Earth, we have more fluids in our lower body because they are pulled down by Earth’s gravity. However, with the absence of gravity in the outer space, our body fluids
18 , shifting toward the upper body and the head. As a result, the astronauts have swollen, puffy faces, very much resembling that of the round-headed Charlie Brown in the famous comic strip. This “Charlie Brown effect” will be more 19 when the astronauts go on their Mars missions, which will take about three years to complete, much longer than missions to the moon. Moreover, the effect is often 20 space motion sickness, headaches, and nausea. Such a syndrome is considered the top health risk for the astronauts, and scientists are still trying to figure out how it may be prevented.

$~~~~$When did people first experience the joy of the hula hoop? Although the term did not emerge until the 18th century, toy hoops twirled around the waist, limbs, or neck can be traced back to ancient times. As early as 1000 BC, Egyptian children played with hoop toys of dried grapevine. They threw, jumped, and slung them around their bodies as we do today. They also struck them with sticks to roll them down the road. Hoop rolling was also popular in ancient Greece. Their hoops, often made of metal, were not merely toys for Greek children but served as exercise devices as well.
$~~~~$In the 14th century, hoops were popular as a form of recreation in Great Britain. The craze for hoops even resulted in dislocated backs and heart attacks, according to medical records. The term “hula,” however, did not enter the English language until the 1700s, when British sailors first witnessed hula dancing in the Hawaiian Islands. Though no hoops were used, the movements of the ritual dances looked very similar to those in hooping. Thus “hula” and “hoop” came together, resulting in the term “hula hooping.”
$~~~~$Hoops spun their way through the cultures of pre-colonial America as well. Often considered as representing the circle of life, hoops featured prominently in the ritual dances of Native Americans. Dancers used small reed hoops as symbolic representations of animals such as eagles or snakes. With very rapid movements, they used the hoops to construct the symbolic forms around their bodies.
$~~~~$The hula hoop gained international popularity in the late 1950s, when a plastic version was successfully marketed by California’s Wham-O toy company. Twenty-five million plastic hoops were sold in less than four months. The hula hoop “fad” is still going strong today.

$~~~~$When you enjoy your morning cup of tea, you are probably not aware that those tea leaves can mean injury, or even death, for Asian elephants roaming Indian tea gardens.
$~~~~$In the Indian state of Assam, growing numbers of tea farms are destroying the Asian elephant’s habitats and endangering their population. Much of the forest land where tea is grown in Assam is flat and thus farmers must dig drainage trenches to prevent water from accumulating and hurting the shrubs. The trenches, however, can be death traps for the elephants. Since the elephants need to use tea plantations as landmarks when navigating forests, they almost inevitably have to move through the farms. Moreover, because there are fewer humans around, pregnant females often use tea-growing areas as safe shelters to give birth. But baby elephants, not used to negotiating rough ground, may easily fall into the trenches and get hurt; and once injured, they might not be able to climb out. When mothers try to dig their babies out, both may be trapped and smothered by thick mud. Furthermore, elephants are known to resist leaving their sick or dying behind, and a herd may linger at a trench with a trapped baby for hours, reluctant to move on until all hope is lost.
$~~~~$Is it possible for elephants to coexist with the prosperous tea business? Elephant Friendly Tea is an organization that takes the initiative to make it possible. The organization encourages consumers to choose brands that take precautions to protect elephants and has set up a certification program to reward tea growers who are doing it right. Until now, only smaller tea brands have been certified, but awareness is growing. The organization believes that people may be motivated to buy elephant-friendly brands when they know more about the risk tea can pose to these endangered animals.

$~~~~$Situated off the coast of Tanzania and washed by the warm, clean waters of the Indian Ocean, Zanzibar is a tropical archipelago comprised of several scattered islands. This popular beach destination is now famous for its white sand beaches, slender palms, and turquoise seas. But few people know that in the past, control of Zanzibar meant access to unimaginable wealth.
$~~~~$From ancient times, Zanzibar has been a trading hotspot, thanks to its location on the trade route between Arabia and Africa. Traders from Asia had already visited the islands 900 years before the arrival of its first permanent settlers from the African mainland (around 1000 AD). In the 8th century, Persian merchants built settlements here, which grew over the next four centuries into their trading posts. Between the 12th and 15th centuries, trade increased between Arabia, Persia, and Zanzibar, bringing the archipelago both wealth and power.
$~~~~$During the Age of Exploration, commerce in Zanzibar quickly boomed, largely due to the rise of the spice trade. At the close of the 15th century, Europeans’ craze for spices gave rise to the Spice Route, a network of sea lanes joining Europe with the Far East, where most spices came from. In 1498, Portuguese explorer Vasco da Gama made the first sea voyage to India, via the southernmost tip of Africa. In 1499, he arrived at Zanzibar, an archipelago sitting at the crossroads of the Spice Route. The islands soon attracted traders from different lands. Hundreds of ships sailing the Spice Route docked here, bringing spices and goods for transaction, and Zanzibar became one of the biggest trading centers in the world.
$~~~~$Since the 16th century, Zanzibar has come under the rule of the Portuguese, the Arabians, and then the British, each leaving a mark on the place. The paths of various religions also crossed here: Muslims have lived peacefully with Christians and Buddhists on the islands for centuries. The unique cultural intersections, scented with the aroma of cloves, vanilla, and cinnamon floating in the air, give these jewels on the Indian Ocean an amazing charm that goes far beyond tropical beach fun.

Even if you’re not a vegetarian, there’s a good chance you’ve heard of plant-based meat. These meat substitutes are often advertised as beneficial for the environment. But do the customers really like them? Read the following chatroom discussions about GreenBurger, a product using alternative-meat patties.
(A) Olivia (B) Smith (C) Mika (D) Thomas (E) Rico (F) Linda (G) Ablo (H) Alexander

提示︰隨著社群媒體的普及，表情符號（emoji）的使用也極為普遍。請參考下列表情符號，寫一篇 英文作文，文分兩段。第一段說明人們何以喜歡使用表情符號，並從下列的表情符號中舉一 至二例，說明表情符號在溝通上有何功能。第二段則以個人或親友的經驗為例，討論表情符 號在訊息表達或解讀上可能造成的誤會或困擾，並提出可以化解的方法。