Mong các bạn giúp bạn nhé :
1. If you walk to school , ..................................................
2. If you use recycled paper , ..........................................
3. If the Earth becomes hotter, ........................................
4. If parents teach thier children about the three Rs, ..................................................................
5. If you want to save a lot of electricity, ........................................
Các bạn giúp mình nha 
1. If you walk to school , you will make the air less polluted .
2. If you use recycled paper , you will save a lot of trees.
3. If the Earth beacomes hotter , the plant and animal will die soon .
4. If the parents teach their children about the three Rs , they will help environment so much.
5. If you want to save a lot of electricity, don't use the bulb
