V.Viết lại câu sao cho nghĩa của câu không thay đổi.(Rewrite the sentence so that its meaning does not change.): 1,Unless you study harder,you'll fail the next exam.=>If.....................................  2,Unless he practices writing every day,he can't improve his writing skill.=>If......................................  3,Unless you returns this book to the library today,you'll have to pay.=>If...............................................  4,Unless you stop wasting money,you will run out of it.=>If..............................................  5,If you don't stop smoking,you will fall seriously ill.=>Unless...........................................  6,The teacher will be furious if you don't do your homework.=>Unless.........................................  7,You can't go on vacation if you don't save some money.=>Unless....................................  8,We'll arrive on time if we hurry.=>Unless.....................................  9,If you exercise regularly,you'll be able to lose some weight.=>Unless.........................................  10,You won't get well unless you stop smoking.=>If.......................................