REWRITE THE FOLLOWING SENTENCES USING "UNLESS"

REWRITE THE FOLLOWING SENTENCES USING "UNLESS" 
1. work hard or you will fail the exams
2.save some money or you won't be able to buy the house
4. they won't let you in if you don't cut your hair
5. do it carefully or you will feel sorry afterwards
6. we will go on holiday if we have enough money 
7. you can't visit the USA if you don't have a visa
8. the child will die if they don't send him for a doctor
9. if he has a key, he can get into the house
10.if he phones now, he will get some information
MNG GIUP EM VOI A EM DANG CAN GAP