He was late for school ________ the snow.

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Judging by his _____ look, he must have met with _____ problems.

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A．puzzled; puzzled　　　B．puzzling; puzzled

C．puzzled; puzzling　　 D．puzzling; puzzling

The best job is ________ which uses your skill in doing something together with your interest in the subject.

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________ in Ottawa, we sent them a telegram.

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Although this medicine can cure you ________ your illness, it has a bad effect you.

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He _____ you more help, even though he was very busy.

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A．might have given　　　B．might give

C．may have given　　　　D．may give

Those of us who work in that chemical plant should have ________ lungs X－rayed.

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The thread breaks ________ it is weakest.

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________ down the stairs, her shoe fell off.

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The delegation has already arrived, but I didn't know it ________ until this morning

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