It is high time we（）something to stop road accidents.

It’s high time we ______ him a regestered letter.A. sendB. sentC. has sentD. had sent

Considering the above－mentioned, I think, it is high time that we college students______a good look of our behavior.

We know much about the universe. It means the earth, the sun, the moon and the stars, and the space __21__ them.
Most of the stars are much bigger than the moon, but they look smaller __22__ they are far away from the earth. At night, the moon is high in the sky like a light. But the moon has no light of its own . The light of the moon __23__ the sun. The sun gives us light, heat and life. And the plants, animals and men will die without the sun. The earth is going round itself __24__. When the part of the earth turns to the sun, it is day. The __25__ part of the earth is night.
The earth is our homeland. We should love it.
21)、
A.because
B.comes from
C.between
D.opposite
E.all the time
22)、
A.because
B.comes from
C.between
D.opposite
E.all the time
23)、
A.because
B.comes from
C.between
D.opposite
E.all the time
24)、
A.because
B.comes from
C.between
D.opposite
E.all the time
25)、
A.because
B.comes from
C.between
D.opposite
E.all the time

It’s time we （) somewhere to eat.

This time yesterday we ________ trees.
A. were planting
B.are planting
C.planted
D.plant

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By the time the talk is over, we （) a lot about aeroplanes.

Does______matter if we can’t finish this job on time？

We will speak to her about it ________ next week.A. sometimesB. sometimeC. some timesD.

While we may get used to a sleep－depriving schedule, our judgment, reaction time, and other functions are still impaired.

Many people would agree that stress is a major problem in modern life. It is certainly true that worry and quarrel can cause all kinds of illnesses,(1)backache to severe headaches, or even more serious complaints such as high blood pressure. 

Many of us think(2)stress as something that other people impose on us. We often complain about how other people put us(3)pressure. But we should try not to let such pressure affect us. We should not forget that we are largely responsible for some of the stress ourselves. We sometimes take(4)more work than our bodies and our minds can handle. We should learn to(5)our limitations. We should be aware of which things are really important and which are not.

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I’ve been telling her time and again that we can’t ______ another holiday, but she won’
A、spend
B、save
C、afford
D、stress

请帮忙给出正确答案和分析，谢谢！