21．A．in order that 　　　 B．if 　　　　　　　　　　　 C．just in case 　　　　 D．unless

19．Jack must be helping his grandma to water the flowers,　　　　 ?

　　　 A．is he　　　　　　　　　 B．isn’t he　　　　　　　 C．must he　　　　　　　 D．mustn’t he

18．On hearing the news, he stood up, and. 　　　　the dictionary lying open on the desk,　　 out of the classroom.

　　　 A．leaving; rushed　　 B．left; rushed　　　　　 C．leaving; rushing　 D．left; rushing

17．　　　　 progress you have made. Congratulations to you!

　　　 A．what great　　　　　 B．How great　　　　　 C．what a great　　　　 D．How great a

16．-Can you tell me　　　　 is the best choice for this job?

　　　 -Well, I think George may be the one.

　　　 A．whom you think　　　　　　　　　　　　　　　　　 B．who do you think

　　　 C．who you think　　　　　　　　　　　　　　　　　　 D．whom do you think

15．It was not until 7 o’clock in the evening　　　 to an end.

　　　 A．did the meeting come　　　　　　　　　　　　　 B．that the meeting came

　　　 C．when the meeting came　　　　　　　　　　　　 D．and the meeting came

14．As most of their houses were badly damaged after the earthquake, many people had to be　 in a stadium.

　　　 A．put away　　　　　　 B．put up　　　　　　　　 C．put out　　　　　　　　 D．put off

13．The captain gave an order in the difficult situation　　 the sailors throw away everything that was on board the ship.

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

12．Disthinguished guests and friends, welcome to our school!　　　 　the ceremony of the 50^th anniversary this morning are our alumni (校友) from home and abroad.

　　　 A．Attend　　　　　　　　 B．To attend　　　　　　 C．Attending　　　　　　 D．Having attended