I.            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 he 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 ...................................................................................................................

       THANKS!!!