20. Will you please keep a certain _______ a way from the fire ?

　　 A. condition　　 B. sign　　 C. far　　 D. distance

19. This is the concert hall ________ he has given very successful performances .

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

18. I heard the clock but then I _______ and went on sleeping ,

　　 A. moved back　　 B. came back　　 C. turned over　　 D. came out

17. Not the wonderful views but the warmth of the hosts ________ moved us all .

　　 A. has　　 B. have　　 C. was　　 D. are

16. The farmers thought of ways ________ their trees .

　　 A. of protect　　 B. protecting　　 C. to protect　　 D. to protecting

15. ---_______ ?

　　 --- I’m sorry , but it’s not allowed .

　　 A. Is Lizzy in　 　　　　　　　　　　B. Is that Lizzy speaking

　　 C. Would you mind my talking here　　 D. Would you like some help