I was ________ about it．I thought you were responsible and that’s why I scolded you．Please forgive me．

A．curious

B．worried

C．particular

D．mistaken

Every possible means ________ to prevent the air pollution, but the sky is still not clear．

A．are being used

B．have been used

C．has been used

D．had been used

I have no ________ to the plan, so long as it would not cost too much．

A．refusal

B．comment

C．idea

D．objection

Don’t use words, expressions or phrases ________ only to people with specific knowledge．

A．being known

B．having been known

C．to be known

D．known

Scientists still wonder ________ cloning will help or harm us and ________ it is leading us．

A．that; what

B．whether; where

C．if; that

D．whether; how

After the National Entrance Examination the students will have an anxious couple of weeks ________ for the results．

A．wait

B．to be waiting

C．waiting

D．waited

Then came the disturbing news ________ Dolly had become seriously ill．

A．how

B．why

C．whether

D．that

Would it be ________ for you to pick me up at four o’clock and take me to the airport?

A．free

B．empty

C．handy

D．convenient

Students should be encouraged to use ________ Internet as ________ resource．

A．不填；a

B．不填；the

C．the; the

D．the; a

In organic farming, natural waste from animals are made use of ________ the fields．

A．fertilizing

B．to fertilize

C．in fertilizing

D．to fertilized