1.Be careful,children!You______step on the grass.
问题描述：
1.Be careful,children!You______step on the grass.
Sorry,we____do that again.
A.needn't won't B.mustn't won't （顺便告诉我选择的原因和知识点）
2.They spent as many hours as they could____waste paper to keep their classsroom clean.
A.to take up B.put up C.picking up D.sent up （顺便告诉我每个词的用法和意思）
3.Remember to e-mail me.All of us hope you_____.
A.quickly B.soon C.fast D.quick （顺便告诉我每个词的用法）
答
1 选BNEEDNOT 是不必的意思,而MUSTNOT是禁止,不能够的意思2 选C 句型是spend sometime doing something ,pick up 捡起take up 占据 占用put up 举起send up 提出3 选B 表示将来比较快~!A C D 都是快的意思,A 用来形...