根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。（每空一词）
Can you give me a useful ___________(suggest) on how to learn a foreign language well. 
He is _______(able) to solve the problem because it’s too hard for him.
What will you buy for your mother on __________ (woman) Day?
It’s the ___________ (sad) story that I have ever read.
Though three __________(four) of the earth is covered with water, we mustn’t waste it.
Last month, Zhang Lili ____________ (honour) with Best Teacher.
---Is this red bag Tom’s?
---No, _________ (he) is black.
If you work hard, you can ___________ (easy) pass the final exam.
The workers often complain that the boss always has them __________ (do) extra work.
I am used to ___________(take) exercise for half an hour every morning.