问题描述：
He is ____man.He is ____old man
A a,a B a,an C an,a
There are two __ and four___on the grass
A sheep,horse B sheeps,horses Csheep,horses
Look!the boys and girls__in the park
A is playing B aye play C are playing
A a,a B a,an C an,a
There are two __ and four___on the grass
A sheep,horse B sheeps,horses Csheep,horses
Look!the boys and girls__in the park
A is playing B aye play C are playing
问题解答：
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