1,I got an email from my classmate yesterday
2,We must be careful aobut our neighbours
3,We can't throw away waste paper,glass and metal
4,We should raise money to help the children povery-stricken area
5,Turn off the light befor you leave the office
6,We opened the windows instead of turning on the air-conditioner
7,What have you sorted in the store?
8,Smoking does harm to your health
9,He takes part in daily activity
10The bus stopped so that the tourist could enjoy the scene
11,It's best to set off now