II. Rewrite the sentence so that its meaning stays the same.
1. They intend to make this beach a clean and beautiful place again.
They plant ..............................................
2. The students started to collect old clothes for their charity programme last week.
The students have .......................................
3. We make the air dirty because we use the car all the time.
If we use ...................................................
4. If I don’t leave now, I’ll miss my train.
Unless I leave ..........................................
5. I won’t be able to do anything unless I have a quiet room.
If I don’t have .................................................