问题描述：
用所给词的适当形式填空.1.They are her______(parent).人在等 2._____(this) are his brothers.
3.Those____(be)my friends.
4.____(be)that your sister?
5.Is that your______(teachers).
3.Those____(be)my friends.
4.____(be)that your sister?
5.Is that your______(teachers).
问题解答：
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