15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 1)

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Left-handers are the odd ones out. Sure, lefties (31) ______up about 10 percent of the population - but, frankly, it seems like society has forgotten about them. Just consider all of the right-handed gadgets, awkwardly designed desks, and cooking tools that fit comfortably only in your right hand. What (32) ______someone to become a lefthand? Scientists aren’t exactly sure, but research points to a complex (33) ______between genes and environment While no exact set of “leftie genes” have been discovered, people who dominantly use their left hands do have more left-handed family members. And researchers have found different brain wirings in righties vs. lefties. But no matter (34) ______it is that drives someone to use their antipodal paw, science has also uncovered a particular set of personality traits that left-handed people tend to have. So for all of you lefties, leftie-loving righties, and ambidextrous folks out there - it’s time to brush up on your left-handed knowledge and help (35) ______an end to leftie discrimination once and for all.

            Water is necessary for life. People can live only a few days (44) _____ it. Yet nearly 25 million people die each year because of it. Both industrial nations and less-developed countries are worried about the (45) ______ and quantity of water in the world. 

Even though people, animals, agriculture, and industry use a lot of water, there is more than enough on the Earth. Water covers about three-fourths of the Earth's surface. However, 97.4 percent of it is salt water. Three-fourths of the Earth's fresh water is frozen in glaciers and in the great polar ice caps. Most of the water we use (46) _____ from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again. 

One of the (47) ______ about water is distribution. Water is not always distributed where the large (48) ______ centers are. Some regions get enough rain, but it is all in one or two short rainy seasons.

Throughout the world there are different ways for people to greet each other. In much of the world, a handshake is the (38) __________ form of welcoming and greeting someone. In many countries around the Mediterranean Sea a (39) ___________ kiss on the cheek is the appropriate way to welcome friends and family. It can be a very (40) __________ surprise if you expect to shake hands and get a kiss or a hug instead. 

At times, it is difficult to tell what sort of greeting (41) ___________ is followed. People may bow, grab another’s arm or even slap the other person on the back. In some places people just smile, look at the other’s face and say nothing. 

Most people in the world are tolerant of visitors and don’t mind what travellers do that seems wrong as long as the visitors are (42)__________. A big part of the delightfulness of world travel is experiencing different customs.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes ____(46)___ ecosystems. If there is too little rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals____(47)___feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fires for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ____(48)___. Polluting the air, soil, and water can harm ecosystems. Building dams on rivers for electric power and irrigation can harm ecosystems ____(49)___ the rivers. Bulldozing wetlands and cutting down forests destroy ecosystems. Ecologists are working with companies and governments to find better ways of ___(50)____ fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people without causing harm to ecosystems.