Do you really consider it ______（值得花时间的）for them to make that experiment?

The biologist　　 to discover why some animals need to hibernate in the winter.

A、set about　 B、set out　　 C、set up　　　 D、set in

It’s good matters to help people when they were in _______(麻烦、n ).

The designs of the new tools should be_____carefully ,so that we can pick out the one which suits our job.

A.examined　 B.tried on　 C.tested　　 D.experimented

His b_______(行为)is worthy of great praise.

At the center of the garden there stands a little board ________”Don’t Pick Flowers”.

A. on which writes  B. that sayC. which reads D. on which is read

The plane will be taking off in _______（大约）five minutes. We can’t be too exact.

The passenger was tired and walked more slowly but he got home_______

　 A. after all　 B. at all C. above all D. in all

Jone and Tony are________friends and they have been keeping________contact since they graduated from college.

A．closely; close 　　 B．close; close

C．closely; closely 　　D．close; closely

Hiking by oneself can be fun and good for health. It may also be good for ______ building.

A. respect　　　 　　 B. friendship　　　 C. reputation　　　 　D. character