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  3. The world’s population continues to grow. There now are about 4 billion of us on earth. That could reach 6 billion by the end of

The world’s population continues to grow. There now are about 4 billion of us on earth. That could reach 6 billion by the end of

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问题   The world’s population continues to grow. There now are about 4 billion of us on
earth. That could reach 6 billion by the end of the century and 11 billion in a farther 75 【M1】______.
years. Experts have long been concerned about such a growth. Where will we find the   
food, water, works, houses, schools and health care for all these people? A major new  【M2】______.
study shows that the situation may be changing. A large and rapid drop in the world’s   
birth rate have taken place during the past 10 years. Families generally are smaller now   【M3】______.
than they were a few years ago. It is happened in both developing and industrial nations.  【M4】______.
Researchers said they found a number of reasons for this. More men and women are   
waiting more longer to get married and are using birth control devices and methods to  【M5】______.
prevent and delay pregnancy. More women are going to school or working at jobs away 【M6】______.
from home instead having children. And more governments, especially in developing  【M7】______.
nations, now support family planned programs to reduce population growth. China is 【M8】______.
one of the nations that has made great program in reducing its population growth. China 【M9】______.
has already cut off its rate of population growth by about one half since 1970. 【M10】______.
【M4】
选项
答案happened改成happening。
解析 语态是主动，且为现在进行时。
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