一、请为下列题目选出最佳答案，每小题1分，共20分。
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1．Our teacher always encourages us_______hard.
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A to study
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B study
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C for study
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D for studying
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2. We will have a football match______is fine tomorrow.
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A if
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B and
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C so
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D but
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3. The whale is the______animal in the world.It is much______than the shark
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A biggest;bigger
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B slimmest;slimmer
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C biggest;biggest
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D bigger;bigger
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