题目内容：
Vocabulary and StructurePlease complete the following sentences with the proper forms of the words given.
1._____a helping hand is a reward in itself.(lend)
2.You can prepare a meal for your____neighbors or cook at a local soup kitchen.(old)
3.The temptation to turn on the TV to relax can actually be____to your health.(harm)
4._____is one of the best prescriptions for daily happiness.(laugh)
5.Often your friends know you_____enough to give you sound advice.(good)
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