根据句子意思, 用括号中所给单词的正确形式填空。（每空限填一个单词）
【小题1】You are lucky, Linda. You didn't hurt __________ (you).
【小题2】We should behave ___________ (polite) in public.
【小题3】How happy I am to celebrate my ___________ (fifteen) birthday tomorrow!
【小题4】If you don't know the name of the plant, please write "_____________" (know) in your notebook.
【小题5】Thomas Edison, one of the greatest ____________ (invent) in the world, created over 1,000 things.