Several months later, he found his deskmate very difficult _______.

________ the mountains was hard work for them but as they looked around, they could not help screaming.

It was so bright outdoors that we could see clearly what was happening through the curtains ________ before the window. 

A driver should ________ the road when _________.

The waters off the Diaoyu islands, first _____ in Ming Dynasty, are our traditional fishing area. 

 In order to prevent the disease ___________ to other districts, the authorized organization killed thousands and thousands of cows.

My father _______ for London tomorrow， for there is______ an  important meeting there.

________ himself in the newspaper, he didn’t notice what was happening．

Henry escaped ________ by admitting his mistake as soon as he saw the headmaster．

 _____many times, they succeeded _________ the experiment.

______ care of the baby, or it may fall ill.

 The angry boy looked at his mother and shouted out the words ________ in his heart for many years.

“If,” he added at the meeting, “________ enough time, we would certainly have done it better.”

She told Tom ________ make the same mistake again.

Time should be made full use of _________ ourselves.

He used to ______ cards, but now he is used to _______ a walk after supper.

He is considered ___________ the work ahead of time.

I didn’t feel like ________, so he suggested ________ an English song right away.

The school headmaster forbids ______ in the office.

To avoid the car ______ the child, the driver had to make a sharp turn.