II.

1. A

2. D

3. A

4. C

5. A

III.

1. Biogas will be used for cooking soon.

2. Low energy lights will be used to save eclectricity.

3. When more people drive car, more cacbon dioxide will be released into the air.

4. On the next Earth Day, global warming effects will be discussed.

5. Solar power will be converted to electricity more efficiently by solar panel.

IV.

1. Earth's fosil fuels are running out.

2. What will be happen if there is no energy in our earth?

3. We are looking for alternative sources of energy.

4. Tday water power is mostly used to generate electrictity.

5. Energy from sun are cleaner, cheaper and safer.

IX.

1. B

2. A

3. C

4. C

5. B

~ Chúc bn hk tốt!~

~ Nếu đc thì cho mk trả lời hay nhất nha!~