23、The engineers made two big plans for the dam, ____ was never put in force.

A、one of them　 B、which　　 C、one of which D、every one of which

22、--What do you think of the concert?

　　 --I really enjoy it. I didn’t expect it was ____ wonderful.

A、as　 B、more C、most D、very

21、--Tom, you are caught late again.

　　 --Oh, ____.

A、not at all　 B、just my luck C、never mind　 D、that’s all right

20、____ the temperature might drop, coal was prepared for warming.

A、To consider　 B、Considered　 C、Considering　 D、To be considered

19、--We must thank you for taking the trouble to cook us a meal.

　　 --____.

A、With pleasure　　 B、It doesn’t matter　 C、It was no trouble at all D、By all means

18、--Do you mind if I smoke?

　　 --____

A、Why not? B、Yes, help yourself　 C、Go ahead D、Yes, but you’d better not

17、--So you missed the meeting.

　　 --____. I got there five minutes before it finished.

A、Not at all　 B、Not exactly　 C、Not especially　 D、Not really

16、____ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunwise.

A、Freed　　 B、Freeing　 C、To free　 D、having freed

15、Young as he is, David has gained ____ rich experience in ____ society.

A、the; the B、a; 不填　 C、不填；不填　 D、不填；the

14、--When did it begin to snow?

　　 --It started ____ the night.

A、during　 B、by　 C、from D、at