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1. If he fails the final exam, he won′t be able to continue his study.
Unless . 

2. I regret speaking to him so severely yesterday.
I wish . 

3. His friends were late so they missed the train.
If . 

4. You wouldn′t have made many mistakes if you had been careful.
You weren′t . 

5. The weather was very cold. We couldn′t go out.
The weather was too .