11。---Will you please show me how to operate the new machine?

　　---Sure。 It’s a piece of cake.Now let me tell you _____ to do first。

　　A.what B.how C.whether D.when

　　12---My trousers are______ out。

　　---I’ll buy you a new pair。

　　A.tried B。 worn C.wearing D.sold

　　13.The rubbish ______we have collected can be recycled。

　　A.who B.which C。 this D.what

　　14。---The artist has got _____ much work to do that he hardly has time to help his wife with the housework。

　　---That’s true.Even on Sundays he is busy with his work。

　　A.too B.so C.very D.such

　　15。---How long have you ____a cough?

　　---Ever since last night。

　　A。 got B。 had C。 caught D。 taken

　　16。 ________ Iraqi people were killed in the war which broke out on March 20。

　　A.Thousand B。 Thousands C。 Thousand of D。 Thousands of

　　17。 I went home and _____ my schoolbag and started to help Mother do the cooking。

　　A。 put off B。 dropped off C.turned off D.shut off

　　18。---He seems _____ ill。 Shall we take him to the hospital right now?

　　---I don’t think it matters。 Maybe he’s caught a bit of a cold。

　　A.terrible B.terribly C.even D.more

　　19。 ---Does the child need any help ?

　　----No.He is old enough to _____ himself。

　　A.put on B.wear C。 take care。 D。 dress

　　20。---This is a really wonderful party with interesting people and great food 。

　　---I’m _____ to hear that you are enjoying yourself。

　　A.sorry B。 glad C。 afraid D。 sure。