题目内容

It is essential that laws and regulations ______ worked out and enforced toprotect water resources.

A. are
B. be
C. being
D. been

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______, due to unforeseen circumstances, this year's show has been cancelled.

A. Unfortunately
B. Undoubted
C. Fortunately
D. Obvious

______, you have mistaken me for somebody else.

A. Unfortunate
B. Fortunately
C. Undoubtedly
D. Obvious

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A. devastate
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This is the beauty and ugliness, good and evil ______.

A. on contrast
B. of contrast
C. at contrast
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