[ Grammar ]
You ______ skill your class. Teacher will lower your grade.
A. must
B. mustn’t
C. have to
D. don’t have to

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A. an island.
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In fat, most of my colleagues are so interesting, that I ___ (think) of writing a bool about them!
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The children do not know ____________ the test was so difficult. (a)
A. Why
B. when
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E. why