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IV. Write:

1.They will show the time machine to the public when they finish it.

The time machine _______________________________

2. Keeping the environment clean is very important.

It’s _______________________________

3. To see this film is very boring.

It’s _______________________________

4. To understand these lessons is not easy.

It’s _______________________________

5. People recycle old car tires to make shoes and sandals.

Old car tires _______________________________

6. People cut the bottles into small pieces.

The bottles _______________________________

7. People mix the small pieces with certain chemicals.

The small pieces _______________________________

8. People heat the mixture into pasty liquid.

The mixture _______________________________

9. People blow the liquid into new bottles.

The liquid _______________________________

10. People recycle used plastic things to save natural resources.

Used _______________________________

11. We are going to clean the environment. We are ready.

We are _______________________________

12. Keeping people from littering is very difficult.

It is  _______________________________

13. She must empty the kitchen garbage. She is not pleased.

She is _______________________________

14. Being able to live in a clean environment is lucky.

It is _______________________________

15. They hear about the plan to collect the used boxes. They are surprised.

They are _______________________________
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