Question

Riwrite:
Keeping the environment clean is very important.
-->It's ..................................................
They will show the time machine to the public when they finish it.
-->The time machine ..................................

how long is it since you used the car ?

-->when ..........................?

We started living here fifteen years ago.
--> We have ..................

Answer 1

Keeping the environment clean is very important.
-->It's ........very important to keep the environment clean........
They will show the time machine to the public when they finish it.
-->The time machine .......will be showed to the public when they finish it.......

How long is it since you used the car ?

-->When .......did you use the car.......?

We started living here fifteen years ago.
--> We have ......lived here for fifteen years......

Answer 2

1.It's very important to keep the enviroment clean.

2. The time machine will be shown to the public when it is finished.

3. When did you last use the car?

4. We have lived here for fifteen years.