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Ответ:

3. If you paid more attention in class, you would understand everything.

4. If they had called before they came, I would have cooked something.

5. If Tim weren't so selfish, he would make friends more easily.

6. If Sandra hadn't got up late today, we would have gone shopping together.

7. If you hadn't left the door unlocked, thieves wouldn't have broken in.

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