________, land may not be ruined.

[　　]

A．When giving proper care

B．Unless giving proper care

C．Given proper care

He locked the door , ________ .

[　　]

A．thus made sure no one would interrupt (打断) him

B．thus making sure no one would interrupt him

C．though made sure no one would interrupt him

________ , he had an accident on the icy road .

[　　]

A．Although driving carefully

B．Even though drove carefully

C．Though driven carefully

________ , we forgot our one o'clock class .

[　　]

A．Absorbing in our conversation

B．Though absorbed in our conversation

C．Absorbed in our conversation

The children stood on the pavement , ________ .

[　　]

A．watching the buses coming and going

B．watched the buses coming and going

C．when watched the buses coming and going

________ , the spaceman saw the Great Wall of China .

[　　]

A．While flew in the spaceship

B．While flying in the spaceship

C．If flew in the spaceship

从所给的四个选项中，选出最佳答案

—Have you rung Professor Li?

—Last week I ______ her for our next meeting but I ______.　　　

[　　]

A．rang, forgot

B．could have rung, forget

C．rang, forget

D．should have rung, forgot

从所给的四个选项中，选出最佳答案

If ______, please rewrite this composition.　　　

[　　]

A．possible

B．it is possibly

C．there is possibly

D．it is possibility

从所给的四个选项中，选出最佳答案

They are looking forward with hope ______ from you soon.　　　

[　　]

A．to hearing

B．of hearing

C．hearing

D．to hear

从所给的四个选项中，选出最佳答案

If city noises ______ from increasing, people ______ shout to be heard even at the dinner table 20 years from now.　　　

[　　]

A．are not kept, will have to

B．are not kept, have

C．do not keep, will have to

D．do not keep, have to