20.　 Mr Zhang, a c________ Ms Zhao is wanting you on the phone.

Unit 21

19.　 Mr Green, how can I speak f_______(流利) English？

18.　 Richard is American, John is British - they have different n_______(国籍).

17.　 I tried to work out the problem, but I was c______ by all the noise.

16.　 I had thought she was a modern girl but she followed family t______ in dress and manners.

15.　 The car almost fell into the river. F_____(幸亏), it stopped just at the edge of the broken bridge.

14.　 －Do you know how to o_______ the machine?

－Yes, my father has taught me.

13.　 If you think what he sings is wonderful, please a_______(鼓掌).

12.　 His success e______(存在) in his intelligence and his way of studies.

11.　 The students sat in s_____because none of them knew how to answer the question.