27. Scientists must go on studying all their lives so as to keep themselves well ____ of the new developments of science and technology.

A. inform　　　　 　B. informed　　　　 　C. informing　　　 　D. be informed

26. Don’t worry, madam, we’ll have your problems _____ to in no time.

A. to see　　　　 　B. seeing　　　　　　 C. saw 　　　　　　D. seen

25. The firefighters had just time enough to rescue the people from the ____ building. Before long the building was ___ down.

A. burned; burned 　B. burning; burning 　C. burning; burned D. burned; burning

24. Westerners have their mail ____ to their doors every day.

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

23. An ____ society is one where ___ people over 60 make up over 10 % of the total population.

A. aged; aged　　 　B. aging; aged　　　 C. aging; aging　 　D. aged; aging

22. The reporter returned just in time to have his article _____ in the next day’s morning paper.

A. to publish　　 　B. publishing　　　 C. published　　　 　D. publish

21. A nation _____ for its own freedom is not easy to be defeated.

A. fighting　　　 　B. fought　　　　　 C. who fought　　　 　D. fight

20. The employee had his salary _____ twice in one year because of his excellent work in increasing the sales of the company’s products.

A. rise　　　　 　　B. risen　　　　　　 C. to raise　　　　 　D. raised

19. At last the man managed to make himself ___ with his ____ French.

A. understood; broken　　　　　　　 　B. understand; break

C. understanding; breaking　　　　　　 D. understand; broken

18.____ for several weeks, the city is now short of food and medicine.

A. After having surrounded　　　　　 　B. Surrounding

C Being surrounded　　　　　　　　　 　D. Having been surrounded