问题描述：
Five buses____ enough for all of us.填are还是 is?
These books each ____ a red coat.
A.costs B.cost 选哪个呢?
麻烦说出原因，
These books each ____ a red coat.
A.costs B.cost 选哪个呢?
麻烦说出原因，
问题解答：
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