题目内容

A variety of boxes ___ to fall down.

A. is
B. are

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The poor （is / are）very happy, but the rich （is / are）sad.

A. is,is
B. are,are
C. is,are
D. are,is

The beautiful ________（live / lives）forever.

A. live
B. lives

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A. are
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A. do
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