51．1ate→later　　 　　　　　52．did后加not

49．very→so　　 　　　　　　50．√

47．moved→moving　　 　　48．sons→son

1-5.DDBBA　 6-10ACCDD 11-15 ADCBB 16-22 DBCABAC_

20.　 A cook will be immediately f______(开除) if he is found smoking in the kitchen.

Keys of UNIT 1-2

19. He is a r_____________ (可信的)man; he never tells lies.

18.He is a well-i_______________man.(消息灵通的)

17.　I have got e____________ (订婚)to a very nice girl.

16. Students should take a correct _____________ (态度) towards criticism from the headteacher.