[     ]

A. walks
B. walked
C. had walked
D. has walked

A. was coming
B. am coming
C. came
D. have come

Great changes have been taken place in my village. Ten years ago, the small and low
houses, which lie on the north of a lake, produced much waste. As the result, the lake
was serious polluted. To the west was a sandy field, that was the source of dust.
Better still, a brickyard on the southwest of the lake used up a great deal good soil.
Now the poor house have been replaced by green trees and the brickyard by tall
buildings. The sandy field that the villagers used to ploughing has been covered with
fruit trees. On the lake the villagers often spend his spare time boating and fishing.
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A. had nearly doubled
B. has nearly doubled
C. nearly doubled
D. has nearly been doubling

Great changes have been taken place in the way people communicate with each other. In the past people write letters to share informations and later they talked with each other in the telephone. Now more and more people use our own mobile phones to communicating. And instead writing on the paper, they e-mail each other on the computer. As a result, people find that quicker and easier to communicate, and at the same time some people feel that they become poorer in writing. They worry about whether people can be as closely as before.
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A. have lost
B. had lost
C. did lose          
D. were losing

A. don't play
B. wasn't playing
C. haven't played
D. hadn't played

A. have develop
B. have developed
C. have to develop
D. have to be developed

A. was    
B. are coming    
C. came    
D. have come

A. had come to;the first time
B. have come; first time
C. have come to; the first time
D. had come; for the first time