Change the sentences that same meaning

II- Change the sentences that same meaning ( Unless= If .......... not) 
7) You can't run fast unless you try your best 
->.........................
8) Unless you lived in the dormitory, you could annoy me.
->......................................
9) Unless the young girl stops smoking, she won't be healthy.
->...........................................
10) Unless people knew you, they wouldn't give you some precious information.
->..................................... 
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