18．Only then ______ how much damage had been caused.　

A. she realized　 　　　　 　　　　B. she had realized　　

C. had she realized　 　　　　　 D. did she realize

17．It was not _____she took off her glasses_____I realized she was my old friend.　

A. when,　 that　　　　 B. until ,　 that　　

　C. until ,　 when　　　　 D. when,　 then

16．Use the umbrella to ______ yourself from the rain.

　　 A. prevent　　 　　　　　 B. keep　　　　　 C. save　　　　　 　　　　　　　　 D. protect

15．______ for a long time, but he managed to catch up with his classmates at last.

　　 A. Having been ill　　　　　　　　　　　 B. Being ill　　 C. He was ill　　 　　　 D. Though ill

14．--Excuse me, what time is it now?

　　 --Sorry, my watch ___.　 It __　 at the shop.

A. isn't working;　 is being repaired

B. doesn't work;　 is being repaired

C. isn't working;　 is repaired

D. doesn't work;　 is repaired

13．Great measures ______ to prevent the air pollution, but the sky is still not clear.

A. is taken　 　 　　　　　　　　　　 　　　 B. are taken　

C. has been taken　 　　　　　　 　　　 　　D. have been taken

12．His stepmother did what she could _____ him．

A．help　　　　 B．helping　　　 C．to help　　　　 D．in helping

11．Do you know the most interesting story __________ took place long ago．

A．which　　　　 B．that　　　　　 C．who　　　　　　 D．×

10．The teacher _________ the gifts to the children．

A．gave away　　 B．gave in　　　 C．give up　　　　 D．give off

9．--Tom seems to have discovered all about the event.

-- ____.

A. So he did　　　　　　　　 B. So do he

C. So he has　　　　 　　　　D. So has he