20. I shall never forget those years ____I lived on the farm with the farmers, ____has a great effect on my life.

　 A. when; who　　　 　　　B. that; which　 　　　C. which; that　　　 　D. when; which

19. With water_____, we must be prepared for the much more serious situation of fighting against the flood.

　 A. rise　　　 　　　　　B. rose　　　　 　　　C. rising　　　　　 　　D. to rise

18. Once_______, this dictionary will be very popular.

　 A. having printed　 　　　B. printing　　 　　　C. to be printed　　 　　D. printed

17. It was the training ____ he had as a young man____ made him such a good engineer．

A．what；that　　 　　　B．which；that　 　　C．that；which　　 　D．that；what

16．Tom works very hard. His brother, ____, doesn’t do much at all.

A．what’s more 　　　 　　B．on the contrary 　　　 C．for one thing 　 　　D．even worse

15.He was considered____ in the supermarket when he was doing shopping yesterday.

A. being badly treated　　　　　 　　　　　　　　　　　 B. treating badly

C. to be treated badly　　　　　　 　　　　　　D. to have been badly treated