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    3. He's watching TV? He's        to be doing his homework.

       A. known   B. supposed

       C. regarded   D. considered

3. B be supposed to do sth.意为"本应做某事"。

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There have been many great inventions,which1       ( change) the way we live. The first great invention was one 2        is still very important today―the wheel. This made it easier to carry heavy things3       (travel) long distances. For hundreds of years after that there were few inventions that have made as much effect as the wheel. There was little unknown land4       (leave) in the world. People did not have to explore much any more. They began to work instead to make life better.

In the second half of the 19th century many great inventions 5       (make) . Among them were the camera,the electric light and the radio. These all became a big part of our life today. The first part of the 20th century 6        more great inventions. The helicopter in 1909. Sound movies in 1926. The computer in 1928,and jet planes in 1930. This was also a time when a new material was made. Nylon came 7        in 1935. It changed the kind of clothes people wear. The middle part of the 20th brought new ways to help people get 8        diseases. They worked very well. They made people healthier and let them live long lives. By the 1960s most people could expect to live to be at least 60.  By this time most people had a very good life. Of course new inventions continued 9       (make) . But man now had a wish to explore again. The world is known to man but the stars are not yet. Man began looking for ways to go into space. Russia made the first step. Then the United States took a step. Since then other countries,10       (include) China and Japan,have made their steps into space.

1.                  2.                  3.                  4.          5.         

6.         7.                 8.                  9.          10.       

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