We make the air dirty because we use the car all the time.
- If we use..........
1. we make the air dirty because we use the car all the time.
- If we use..............................................................................................
2.If I don't leave now, I'll miss my train.
-Unless I leave......................................................................................
3.I won't be able to do anything unless I have a quiet room.
-If I don't have.........................................................................
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