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1.She will be late she doesn't hurry                           
=> Unless
2.It took Peter three hours to open the doors 
=>Peter
3. Taxis are more expensive than buses
=>Buses aren't
4. Halloween in Mexico is not the same as Halloween in the Us
=>Halloween in Mexico 
5. Mr .Nam liked that sports car. However , he couldn't afford it
=> Mr. Nam
6. Tom didn't go to class yesterday
=>Tom was