单项选择题

It is (necessary) that the (customs) (of all) nations (must be respected).

A．necessary
B．customs
C．of all
D．must be respected
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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
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
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