题目内容

Mary is swimming ___ the river.

A. to cross
B. crossing
C. across

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Listen! Someone is ___ in the dark.

A. sing
B. singing
C. sings

— Excuse me. Who ___ eating the bones?— The dogs.

A. are
B. is
C. must

Is your brother _ a book or _ TV?

A. reading/looking
B. reading/watching
C. looking/watching

My family ___ all at home this evening.

A. are
B. is
C. am