Câu điều kiện loại 1
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1. The air _______ (not be) so polluted if people _______ (not drive) too many cars.
won't be - don't drive
2. What _______ you _______ (do) if you _______ (see) somebody litter?
will you do - see
3. If we _______ (keep) using oil, we _______ (run) out of it soon.
keep - will run
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