1.If you turn on the light all night , you will waste electricity

2.If you try again , you will find it easier

3.I suggest using solar energy instead of oil , gas or nuclear power

4.Since there is air pollution, we have to cope with respiratory problems.

5.We'll conserve the Earth's resources if you save energy 

6.Mr. Minh is a very good plumber

7.Though Thuy didn't have much money, she bouht an expensive cellphone.

8.It rained heavily, Lan had to go to the train station to pick up her grandma.

9.The children who are playing marbles in the park are my students.

10.The house in which I am living with my family was built five years ago.

11.Mr Barack Obama who is the US president has two daughters

12.Although Mai is sick, she has  to go to take her exams

13.As banana leaves are easy to dissolve, we should use them to wrap food

14.Lan is a hard-working student

15.If we burn the garbage,we will cause air pollution

1. If you don't turn off the lights, you will waste electricity.

2. If you try again, you will find it easier.

3. I suggest using solar energy instead of oil, gas, or nuclear power. 

4. Since there is air pollution, we have to cope with respiratory problems.

5. We will conserve the Earth's resources if we save energy.

6. Mr. Minh is a very good plumber.

7. Though  Thuy didn't have much money, she bought an expensive cellphone.

8. It rained heavily, but Lan had to go to the train station to pick up her grandma.

9. The children who are my students are playing marbles in the park.

10. The house in which I was living with my family was built five years ago.

11. Mr. Obama, who is the US president, has two daughters.

12. Although Mai was sick, she has to go to school to take her exams.

13. As the banana leaves are easy to dissolve, we should use them to warp food.

14. Lan is a hard-working student.

15. If we burn the garbage, we will cause air pollution.