根据句意用括号内所给汉语提示完成句子。

1. Little Tom always has _______ (奇怪的) ideas in his mind.

2. LiLei is a _______ (勤勉的) student, all the teachers like him very much.

3. Never be _______ (粗鲁的)to the elderly, it's impolite.

4. I'm sorry I _______ (忘记)to post the letter for you yesterday.

5.YueFei is a great person in Chinese _______ (历史).