20.-Must I turn off the gas after taking a bath?

　 --Of course. You can never be _______ careful with that.

A.enough　　　　　　　　　 B. too　　　　　　　 　C. so　　　　　　　 　　D. very

19.When spelling a long word, be careful not to ________ a single word.

A. leave out　　　　　　　 B. leave for　　 　　　　C.leave off　 　　　　　D. leave alone

18.The teacher was _______ when he heard the _______ news.

A. annoying;annoying　 　　　　　　　　　　　　　B. annoying;annoyed　

C. annoyed;annoyed　　 　　　　　　　　　　　　D. annoyed;annoying

17.The mother didn't know who _______ for the broken glass.

A. blamed　　　　　　　　 B. to blame　　　　 　　C. should blame　　　 　D. would blame

16.Washington, a state in the United States,was named ________ one of the greatest American

presidents, _________ him.

A. after;in honour of　　　　　　　　　　　　　　 B. for;in favor of

　 C. after;in praise of　　　　　　　　　　　　　　 　D. for;in place of

15.The custom has been ________ from generation to generation.　　　　　　　　　　　　　　　

A. passed away　　　 　　　B. passed down　　　 　C. passed by　　　　 　D. passed off

14.The village has developed a lot ________ we learned farming two years ago.

　　 A.when　　　　　　　　　 B. which　　　　　　 　C. that　　　　　　　 　D. where

13.--Where is that report?

　 --I brought it to you _______ you were in Mr Black’s office yesterday.　　　　　　　　　

　　 A. if　　　　　　　　　 B. when　　　　　　　 C. because　　　　　 　D. before