He asked me whether my brother(fly) to Beijing.

This diploma ( 毕业文凭 ) ________ that you have completed high school.

I prefer this diagram ________ that one.

(catch) in the rain, he was wet to the skin.

To succeed in a scientific research project ________.

You ________ go now. It ’s getting late.

How longthey(dig) the ditch?

Only when you have obtained sufficient data ________ come to a sound conclusion.

he teacher told them since light(travel) faster than sound,lightning(appear) to go before thunder.

The more we looked at the picture, ________.

Comrade Li ________ be in Beijing because I saw him in town only a few minutes ago.

I know it isn ’t important but I can ’t help ________ about it.

Night(fall), we hurried home.

We were busy(get) things ready for the trial production when he phoned us.

The floor does not look so bad when(sweep) clean. 

The director recommended that she(study) more English before going abroad.

I shall never forget(meet) the late Premier Zhou during his inspection of our factory.

I have been studying here for four years, by next summer I ________.

Hot metal ________ as it grows cooler.

Wood does not conduct electricity; ________.