________ he is poor in health, he works hard.

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　　   she was tired, she went on working.

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Although it was raining hard, ________ they still went on marching.

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John plays football ________, if not better than, David.

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When ________, the museum will be open to the public next year.

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Unless ________ to speak, you should remain silent at the conference.

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Be careful when ________ the road.

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His failure was ________ his laziness.

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He didn't turn up at the party ________ some reason.

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Do you know the reason ________ his coming late?

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