题目内容

About 71% of the earth _______ covered by water.

A. is
B. are
C. be
D. am

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The number of the students _ increased in recent years and a number of them __ from the countryside.

A. have; are
B. has; is
C. has; are
D. have; is

Eachminuteandsecond _______ valuable to us.

A. is
B. are
C. being
D. to be

A knife and fork _____ on the table.

A. are
B. is
C. to be
D. be

英语句子中，谓语动词的数必须与宾语的数保持一致。

A. 对
B. 错