6．After seven years’ work, Chinese scientists ______ the task of launching our country’s first spaceship into space.

A. achieved　 　　　　　　　 B. operated

C. succeeded　 　　　　　　 D. gained

5．Only by ______ can we win the war against the powerful enemy, or we’ll be defeated by him one by one in the end.

A. telling the truth　 　　 B. joining hands

C. paying attention　 　　 D. taking part

4．The headmaster demanded that all the books ______ be returned to the school library at once.

A. could　 　　　　　　　　　 B. would

C. should　 　　　　　　　　　 D. might

3．One of the reasons ______ Bruce left home was ______ he wanted to travel around the world.

A. why; that　 　　　　　　　　　　 B. which; that

C. why; whether　 　　　　 D. for which; because

2．Mary’s only son has been in ______ prison for five years. She went to ______ prison to see him this morning.

A. 不填； 不填　 　　　　　　　 B. 不填； the

C. the; 不填　 　　　　　　 D. the; the

1．I like the appearance of the house very much; however, ______ really made me decide to buy it was the fact that it lies beside a river.

A. which　　 　　　 B. what

C. that　 　　　　　　　　　　　 D. where

10．not until

9．has a good/large collection of

8．to make herself heard

7．introduced