25. -Do remember not to touch the kettle full of boiling water, or you will get burned.

　　 -__________

A. What for? 　 　　　 　　　 B. Why not?　　　　　 　　　 C. Got it.　　　　 　　 　　　 D. Never mind.

24. If the rules of perspective had not been discovered, no one __________ able to paint such realistic pictures.

A. would be　　　 　　　　　　 B. would have been　　 　　　 C. should be　　　　　 D. should have been

23. Nowadays many people prefer to have the booked goods _________ to their house rather than come to the shop for them.

A. to deliver　　　　　　 　　　 B. delivered　　　　　　 　　　 C. be delivered　　　 　　 D. delivering

22. __________ students were absent from the meeting yesterday, which annoyed the school authority.

A. A great number of　　　　　　　 B. The number of　　　　　 C. A great deal of　　　　　 D. Many of

21. Most teachers try to give their lessons in a way __________ will impress students deeply.

　 A. in which　　　 　 　　　 B. by which　　　　 　 C. what　 　　 　　　　　 D. that

20. As is reported, H1N1 flu can result in death unless left ________ in time.

A. treated　 　　 　　　 　　　 B. treat　　　　　　 　　 C. to treat　　　　　　　 　 　 　　　 D. treating