20. The students had the lights ___________ for almost three hours.

A. to burn　　　　 　　 B. burning　　　　 　　　　 C. burnt　 　　　　　　 D. to be burning

19. “Do you have any clothes _______ today, Master?” asked the servant politely.

　　 A. to wash　　　　 　　 B. to be washed　　　 　　 C. washing　　　 　　　　 D. being washed

18. _________ it is to have a cold drink on such a hot day!

　　 A. What a fun　 　　 B. How fun　　　 　　　　 C. What fun　　　 　　　　 D. How a fun

17. Some birds fly ______in winter and some stay in the north.

A. south 　　B. the south　　　　 　 C. in the south 　　D. to south

16．I don’t think math　　　　　 .

　　　　 A．easily to be learned　 　　　　　　　 B．easily to learn

　　　　 C．easy to be learning　　 　　　　　　　　 D．easy to learn

15.To her surprise, the life she had been looking forward to ________ to be unpleasant.　

A. prove　　　　　 B. being proved　　　 C. proving　　　　　 D. proved