题目内容：
Vocabulary and StructurePlease complete the following sentences with the proper forms of the words given.
1.What____us most was his performance in the play.(impression)
2.The object of this society is to perfect its members____and scientifically.(practical)
3._____help from others can make this easier.(enlist)
4.He was____from public employment.(discharge)
5.We can certify his_____.(honest)
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