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【Wearesurethey'llcometohelpus_______theyarefree.Boysandgirls,handinyourexercies-books_______yougohome.______thebellrang,shewaswaitinginherseat.】
题目内容：
We are sure they'll come to help us_______they are free.Boys and girls,hand in your exercies-
books_______you go home.
______the bell rang,she was waiting in her seat.优质解答
when；
before；
when
books_______you go home.
______the bell rang,she was waiting in her seat.
优质解答
before；
when
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