1.His age prevents him from doing anything.

2.The hotel where we stayed last summer was very luxurious.

3.They decided to reduce the number of lights in the house. (cut down on=reduce)

4.Because there are exhaust fumes from cars, the air is badly polluted

5.The little boy used to get up late in the morning

6.Nam's father suggested that he should study hard so that he wouldn't fail the next exam (câu này mik không chắc lắm)

7.My uncle said to me his house would be repainted for Tet.

8.It was such an interesting program that we couldn't turn the TV off.

9.The laboratory which has a lot of chemicals is where that young scientist is working.

10.How long is it since they first used this kind of energy-saving bulb?

11.That's the singer whose picture appeared in this morning newspaper.

12.It was such good news that she smiled happily.

13.Peter takes pride in being a good computer programmer.

14. What I am impressed with is her ability to run a company.

15. I am glad that you are interested in reading the book I gave you. 

16. It is not necessary for you to change your address.

17. It is very important to keep the environment clean.