III. Complete the second sentence so that it has the same meaning to the first

1. Chemical wastes pollute our enviroment.

→ Our enviroment ___________________________________________________________

2. To study Vietnamese is not very difficult.

→ It is not _________________________________________________________________

3. The workers will build many new houses in that area in next year.

→ Many new houses _________________________________________________________

4. We study hard because we don’t want to fail the final exam.

→ We study hard ____________________________________________________________

5. People use first – aid because they want to ease the victim’s pain and anxiety.

→ People use first – aid so as __________________________________________________

6. The committee will change the plan of recycling.

→ The plan of ______________________________________________________________

7.People grow rice in many countries in the world.

→ Rice ____________________________________________________________________

8. Graham Bell invented the telephone many years ago.

→ The telephone ____________________________________________________________

9. They have used this car for many years.

→ This car _________________________________________________________________

10. Lan has to practice English every day. ( Modal verb )

→ English _________________________________________________________________

11. They will take the garbage out of the city.

→ The garbage _____________________________________________________________

12. She hasn’t used this bicycle for a long time.

→ This bicycle _____________________________________________________________

13. I saw a strange man in my garden yesterday.

→ A strange man ____________________________________________________________

14. They clean the floor every morning.

→ The floor ________________________________________________________________

15. They will solve the problem soon.

→ The problem _____________________________________________________________

II. Use the correct form of the word given to complete each sentence.

1. One ton of recycled paper saves ………………………… eight trees (approximate)

2. Miss White is a ……………………………. from “ Friends of the Earth ”. (represent)

3. Cool the burn …………………………. So as to minimize tissue damage. (immediate)

(3n) ¹⁰⁰

=3¹⁰⁰ . n ¹⁰⁰

=3⁴. 3⁹⁶.n¹⁰⁰

=81. 3⁹⁶. n¹⁰⁰

vì 81 có thể chia cho hết cho 81

vậy => 81. 3⁹⁶. n¹⁰⁰

vậy (3n) ¹⁰⁰ chia hết cho 81