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可能做直线运动 一定做曲线运动 速率先减小后增大， 速率先增大后减小
can’t should mustn’t shall
more carefully the most carefully less carefully the least carefully.
gets through stands out sets aside holds up
is raining, didn’t come is to rain, won’t start.. will rain, haven’t started is going to rain, hadn’t come
works is working has worked worked
offer support guarantee want
Take it easy I’m sorry Not a bit It depends.
Being It being To be It is
being concerned be concerned concerned concerning
a, the the, a the , the a , a
of; from of; in in; from in; in
As a matter of fact Anyway In return In a way.
Happy and excited Happily and excited Happily and excitedly Happy and excitedly
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