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Let’s learn to use the problem we are facing      a stepping-stone to future success.
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.—____ when has the country been open to international trade? —1978, I suppose.
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The president has told his friends that he is sick but will not admit it _____.
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Rose was wild with joy         the result of the examination.
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_____ the three elements of productive forces, namely, the people, the means of production and the subject of labor, the people is that most critical.
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—Mike, are you familiar ________ this new type of car? Just give me some advice.—Oh, I'm sorry. It is really a new one.
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