if it ain't broke,fix it.if you can't fix it,smash it up.

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• if it ain't broke,fix it.if you can't fix it,smash it up.
• 1.The girl is too young ,and she can't do such hard work.（改为同义句）2.He has _fifteen_ bikes to fix up.（对画线部分填空）3.I don't have any more of it.(改为同义句）4.This volunteer work takes her several hours a week （改为同义句）She —— several hours a week —— this volunteer work.5.He told his teacher about his problems.（改为否定句）6.You mustn't fight back.（改为祈使句）7.All the people in the room laughed at him because of his new hairstyle.(改为被动句)8.I feel like going for a walk this aft
• 下底长12 上底长9
• 梯形的两条对角线互相垂直,长度分别是30厘米,16厘米,这个梯形面积是多少?