21．Have you heard_____report? People with______good knowledge of engineering are in great need in the job market.

29．In 1778, Banks was elected_____president of_______Royal Society,___________position he held for 42 years.

A．/, /, a

B．/, the, a

C．the, /, a

D．the, the, the

21. In recent years _____ global warming is becoming ____concern for people all over the world.

23. In face of        failure, it is the most important to keep up        good state of mind.

A．a; 不填

B．不填; a

C．the; 不填

D．不填; the

______ apple fell from the tree and hit him on ______ head.

Have you heard ______ news？The piece of _______ petrol is going up again!

In many places in China,       bicycle is still       poplar means of transportation.

It’s not ___ good idea to drive for four hours without ___ break.

I like _______ color of your skirt.It is _______ good match for your blouse.

Many people have come to realize that they should go on___balanced diet and make___room in their day for exercise.