单项选择题

Hydrogen is one of the most important elements in the universe ______ it provides the building blocks from which the other elements are produced.

A. so that
B. but that
C. provided that
D. in that

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单项选择题

I'd rather that they ______ during the bad weather, but they insist that they must return home today.

A. don't travel
B. didn't travel
C. shouldn't travel
D. not travel

单项选择题

Others viewed the findings with ______, noting that a cause-and-effect relationship between passive smoking and cancer remains to be shown.

A. optimism
B. passion
C. caution
D. deliberation

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