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题型：单选题题类：模拟题难易度：普通

If you for your favorite TV programs, you will feel sleepy.

A、stay up B、set up C、 stay at D、pick up

举一反三

— Lily, can you help me ______?

— Sure. Where's the brush?

As a kind of important energy, coal(煤炭) can _______ one day.

——Shall we go for a picnic tomorrow?

——Well, it all ________ the weather.

— Oh, it's 17: 40. Let's the food for dinner.

— OK. What about fruit salad?

I feel it hard to keep up with my classmates. But whenever I want to ， my teacher always encourages me to work harder.

The maths problem was so difficult that none of us could _______.

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