2Must the work be done at once? 这工作必须马上做吗
3 Some trees can be planted to make our school greener可以种一些树绿化我们的校园
4 Rubbish shouldn't be thrown on the ground 垃圾不应该扔在地上
5 The second point needn't be discussed at the meeting第二点没有必要在会上讨论
6 The sketch may be drawn in pencil 草图可以用铅笔画
Some trees can be planted to make our school greener.我们可以种些树，使我们学校更绿化。
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024