20．There are three bedrooms in the house, _________ is Mary’s．

A．the smallest of which　　　 B．the smaller of which

C．the smallest of them　　　　 D．the smallest one

19．How can you expect mercy from others 　________ you show none?

A．before　 　　 B．and　 　 C．in case　 　　 D．when　

18．There is a better way to teach students _________ value of ________ life than inviting an old professor to give some boring speech．

A．the; a　 　　　 B．/; the　 　　　 C．a; /　　 　 D．the; /　

17. He kept a little notebook, in which ________ the names and addresses of his friends.

　 A. wrote　　　　　 B. writing　　　　　 C. was written　　　　 D. were written

16. ____with his slippers on when he heard the terrible noise.

A. Out did the policeman rush　　 B. Rushed the policeman out

C. Out rushed the policeman　　　 D. Out the policeman rushed