单项选择题

I don' t think physics (is) hard (to learn). (However), my physics (are) very poor.

A．is
B．to learn
C．However
D．are
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单项选择题
The (three-fields) system is an agricultural method in which one field (out of) (three) is (left) to lie fallow while the other two fields are being cultivated.
A．three-fields
B．out of
C．three
D．left
单项选择题
Tim will not (lent) you the book (because) he is fearful (if) you will forget to (return) it.
A．lent
B．because
C．if
D．return
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