1. If we use recycled paper, we will save trees.

2. Classroom will cleaner if there is a rubbish bin in every class.

3. Turn off the lights when we don't use.

4. Don't throw rubbish in the river.

5. If we plant trees in our school yard, our school will be a green place.

6. You should turn off the tap when brushing your teeth.

7. A super smart TV will help us ordering the food from the supermarket.

8. I still not sure where to go on my holiday.

9. The weather is not good. It is going to rain this afternoon.

10. If I am the president in the club, I will encourage students to go to school by bus.

11. If we get lots of money, we will buy energy-saving lights in every class.

12. There is a swimming pool in front of the large flower garden behind the house.

13. What an expensive car!

14. Mai has never watched a 3D movie.

15. In the year 2030, robots will be able to do all the housework instead of us.

Chúc bạn học tốt!!! NẾu ĐC thì cho mình ctlhn nhé

- Chúc bạn học tốt !!!!!!! ~