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1. It′s over twenty years since we got married.
We have . 

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

3. It′s not easy to predict her temperament.
Her temperament tends . 

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

5. “I advise you to take a holiday,” the doctor continued.
You′d .