I wrote a letter to John for his help during my high school years. without which I the college entrance exam.

I wrote a letter to John for his help during my high school years. without which I  the college entrance exam.

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would fail

would have failed

should fail

must have failed

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—What a pity! Their experiment is a failure.—They ________ better under more favorable conditions.

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should have done

could have done

must have done

may have done

I think that's unlikely to happen, but if that_______, both America's and China's interest would be severely damaged.

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should occur

occurs

had occurred

is going to occur

 To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.

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could

might

would

must

Luckily some friends living locally came to visit me regularly and I went home every weekend, or I________mad.

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was going　

would have gone

would go　

had gone

It’ s suggested by experts that teenagers ____at least 30 minutes exercising, five times a week.

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spend

to spend

spent

have spent