根据句意和所给汉语，完成句子。每空一词
【小题1】The famous doctor graduated from a famous _________（医学的）university.
【小题2】Birds are the natural _________（敌人）of many insects.
【小题3】What's the _________（目的）of your action？
【小题4】He is so full of _________（精力）that he can't keep still.
【小题5】My brother is doing something to celebrate his _________（胜利）