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One of the most important problems they had to consider was________of public health.
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A
what
B
this
C
that
D
which
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The young man is very clever; he may be     Edison.
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He didn’t make     clear when and where the meeting would be held.
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I don’t mind her pointing out my mistakes, but ____ is how she does it that I dislike.
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Jenny isn’t doing ________ now. Maybe she can help sweep the floor.
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I would appreciate ______ very much if you help me with my English.
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