单项选择题

Sometimes children have trouble （） fact from fiction and may believe that such things actually exist.

A. to separate
B. separating
C. for separating
D. of separating

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单项选择题
As teachers we should concern ourselves with what is said, not what we think （）.

A. ought to be said
B. must say
C. have to be said
D. need to say
单项选择题
Great as Newton was, many of his ideas （） today and are being modified by the work of scientists of our time.

A. are to challenge
B. may be challenged
C. have been challenged
D. are challenging
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