Question

初二英语.

Answer 1

2, Must the work be done at once?

追答

3, Some trees can be planted to make our school greener.
4, Rubbish shouldn't be thrown on the ground.
5, The second point needn't be discussed at this meeting.
6, The sketch may be drawn in pencil.

谢谢好评

Answer 2

Must the work be done by us at once?
Some trees can be planted to make our school greener.
Rubbish shouldn't be thrown on the ground.
The second point needn't be discuss at this meeting.
The sketch may be drawn in pencil.