改错：每句只有一处错误,画出并改正

改错：每句只有一处错误,画出并改正
1.There were a fire drill yesterday
2.We must walk quick down the stairs
3.We must be carefully.
4.We must talk quiet at the library
5.It is not a really fire

1 去掉a
2 walk加ing
3 carefully去掉ly
4 at改in
5 not改don't

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