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1. Walking home alone is not a good idea.
You . 

2. I don′t have enough money to buy that book.
If . 

3. We must do our work well or the master will get angry with us.
Unless . 

4. We haven′t got a big house. We can′t invite friends to stay.
If . 

5. It is said that he died by his own hand.
He is .