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1. Stop talking or you won′t understand the lesson.
If . 

2. But for Pauline′s interest, the project would have been abandoned.
If . 

3. I used my calculator; otherwise I′d have taken longer.
Had . 

4. I don′t have any scissors so I can′t lend you any.
If . 

5. He lost his money simply because he wasn′t careful.
If .