31.If he _______ harder，he will catch up with us soon.(study)

30.-Peter，could you come and help me in the kitchen，please？

-Sorry，Mum.I _______ Lily with her English.(help)

-How clean and tidy your class room is！

-Thank you.It _______ everyday.(clean)

29. This year　 _________ (make)World Year of Physics Albert Einstein，_______ (remember)the father of modern physics.

28.Teacher toid us that light_______(travel)at a high speed.

27. -　　 　　you　 　　　　　(hear)　 about　 Dr. Norman Bethune?

-Of course. Everyone in China　　　 　(know) about this famous Canadian doctor. He 　　　 　(help) us in the Anti-Japanese War. He　　　 　(always, remember) by us Chinese people.

26. He said she　　　 　(work) as a reporter since 1995.

25. Last year Tom　　　 　(award) the first prize in the university.

24.A waiter's job is 　　　　customers.(serve)

23.More patients ______ in hospital this year than last year.(treat)

22.The first use of atomic weapons was in 1945 and their power ______ enormously ever since.(increase)