题目内容：

根据句意、汉语或音标提示，写出各单词的正确形式，每空限填一词。

1.As we all know, fish can’t live ______(没有) water or air.

2.Tommy’s sister isn’t ______(勇敢). She often feels afraid when she is at home alone.

3.I didn’t see them ______(进入) the room because I was in the bedroom then.

4.—What does your schoolbag ______([wei]) ? —I think it’s about 7 kilograms.

5.We wrote to each other before. But now Lucy sometimes ______([ri'plai]) to me by email.