单项选择题

There ought to be less anxiety over the perceived risk of getting cancer than ______ in the public mind today.

A. exists
B. exist
C. existing
D. existed
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单项选择题
Hydrogen is the fundamental element of the universe ______ it provides the building blocks from which the other elements are produced.
A. so that
B. but that
C. in that
D. provided that
单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ________it comes to classroom tests.
A. before
B. as
C. since
D. when
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