19.---Could you please tell me how much a double room______?

　 ---Sorry,I don’t know.You’d better call the hotel by the number on the brochure.

　 A. takes　 B.spends　 C.costs　 D.pays

18.---Mike,this is the medicine for you.Take three pills now and three more ____ time.

　 ---OK.

　 A.in four hours　 B.in four hour’s　 C.in four hours’　 D.in four hour]

17.---Will you stay for lunch?

　 ---Sorry,I_____.My friend is coming to see me.

　 A.won’t　’t　 C.mustn’t　 D.needn’t

16.If everyone makes a contribution to _____ the environment,the world will become much more beautiful.

　 A.protecting　 B.producing　 C.preparing　 D.practising

15.---Hi,Allen._____ are you leaving for Hainan Island?

　 ---To relax myself.

　 A.What　 B.Why　 C.How　 D.When

14.---I’ve just cleaned the kitchen.

　 ---Really? I ____ that hours ago.

　 A.have done　 B.do　 C.did　 D.had done

13.Today they are going to have real English food,_____?

　 A.doesn’t it　 B.isn’t it　 C.don’t they　 D.aren’t they

12.Mom and Dad are teachers._____ of them love teachoing very much.

　her　 B.None　 C.All　 D.Both

从A、B、C、D四个选项中，选出可以填入空白处的最佳答案。

11.---Do you know Yang Liping?

　 ---Yes,she is ______ very famous dancer. A./　 B.a　 C.the　 D.an