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I suppose you are not serious, __________？

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This composition is good __________ some spelling mistakes.

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Our students are free to study _____ interests them.

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Mathematics _____ easy to learn.

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It’s never _____ .

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I don’t know whether he is still _____ in collecting coins. He u

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The noise outside was _____.

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In ancient China, people used to send smoke _____ to warn that t

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The icy conditions made our travel dangerous. So _____ going by

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Sometimes my job is boring, but _____ I enjoy it.

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