20. 　　　is known to us all is that the 2012 Summer Olymic Games will take place in London.

A. It　 B. What　 C. As　 D. Which

19. Mr. Brown lay　　　 awake all night wondering whether to leave or stay.

A.wide　 B.well　 C.much　 D.very

18. It was not until the train was out of sight　　　 they stopped waving their hands.

A. when　 B.before　 C.since　 D.that

17．I promise that you　　　 receive all the money that is owed to you.

A. should　 B.must　 C.shall　

16. -Oh,dear! We only have 15 minutes to get to the station!

-So terrible! There isn’t any taxi around when you want　　　 .

A. one　 B. it　 C. that　 D. this

15. -Mom, where　　　 you put my coat?

　　 -I left it on the sofa when you　　　 breakfast.

A. had;were having　 B. do;are having　 C. did;were having　 D. would;had