16. D

17. B

18. B

19. A

20. C

21. C

22. C

23. D

11. B

12. C

13. B

14. C

15. C

1. A

2. D

3. B

4. A

5. B (gạch chữ "th")

41. Solar panels are quite expensive to install but we well save money on electricity in the end.

42. China produces the largest wind power in the world.

43. Coal is more expensive and polluting than natural gas.

44. We are looking for cheap, clean and effective sources of energy.

45. I'm going to buy a hybrid car because it uses less gas than other cars. 

Task 1:

1. T

2. F

3. F

4. T

5. T

Task 2:

1. She is 8 years old.

2. Yes, he is

3. No, she isn't

4. Her name is Thu

5. His name is Hung

6. She is a pupil

1. are

2. are

3. is

4. is

5. is

6. are

7. Is

8. is

1.Why is tourism important to some countries?

=> Some countries need the money from tourism to help their people survive. 

2.How does tourism affect the environment?

=> Planes, buses, boats and other means of transportation that carry travellers and tourists cause pollution.

3. What do many people use a lot when staying in hotels?

=> They use a lot of water and electricity when they stay in hotels. 

4. Why do some tourists end up leaving large amounts of wastebehind?

=> Because it is often difficult or impossible for travellers to recycle items

 5. What shouldn't you do to be environmentally friendly? Mention twoideas.

- Throw rubbish on streets, beaches or in the countryside.

- Use too much water or electricity.

Lâu lắm mới tham gia trả lời câu hỏi vuii

Unless we put rubbish into recycling bins, our streets will be dirty.