You have failed two tests.You’d better start working harder,______

You have failed two tests.You’d better start working harder,_______ you won’t pass the course.

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and

but

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____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.

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I’ll help you _______ I don’t sleep for night.

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The fact that smoking is harmful to health is__________ most smokers admit．

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I’m sorry, _________ I won’t be able to come tonight.

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We were having a meeting _________ suddenly someone knocked at the door.

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