30. About 90 percent of the equipment presented by the administration， as well as the facilities of our own， 　　 made good use of in the teaching.

A.have　 B.has　 C.have been　 D.has been

29. Never before 　　 in greater need of technical experts than it is today.

A.has Hunan been　 B.Hunan has been

C.was Hunan　 D.Hunan was

28. It is only 　　 people know the importance of science 　　 science can really serve the people.

A.that； when　 B.when； that　 C.then； that　 D.that； then

27. Sorry， I didn’t hear you. I 　　 to the music.

A.just listened 　　 　B.was just listening　 C.has just listened 　 　D.had just listened

26. The fact has worried many scientists 　　 the earth is becoming warmer and warmer these years.

A.what　 B.which　 C.that　 D.though

25. If one 　　 succeed， one must put his heart into his career.

A.will　　 　　　　　　 　B.is going to　 C.is to　 D.is about to

24. The book was written in 1946， 　　 the education system has witnessed great changes.

A.when　　　　　　　 B.during which　　　 C.since then　 D.since when

23. My wallet isn’t in my bag. Where 　　 I have put it？

　　　　　　　　　 　 B.must　　　　 　　　 　C.should 　　　　 　D.shall

22. Many children may be fond of animals， but 　　 ever think of making the study of animals their career.

A.a few　 B.few　　　　 C.some 　　　　　 　D.any

21. The country has already sent up three unmanned spacecrafts， the most recent 　　 at the end of last March.

A.has been launched　 B.having been launched

C.being launched　 D.to be launched