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

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

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

A. can                            B. must                   C. should                D. shall

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

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

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

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

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

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

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

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

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

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