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4.B:Well,if you had studied harder,you wouldnt have failed
5.B:If I were you,I would go to the dentist.
6.B:If I hadnt left the door open,the puppy wouldnt have escaped.
7.B:If I had not been late,we wouldnt have missed the bus.
8.B:Where would you go,if you could travel anywhere in the world
9.B:If I were you,I would go to America.
9.B:Well,if I were you,I would report it to the police.
10.B: Well,if you had been careful,you wouldnt have cut yourself.