根据句意，用所给单词的适当形式填空。
Would you like to help the _______ (able) people?
I think it is_______ ( use ) to learn English.
Some people do not have enough money for ______ (medicine) treatment.
It is ______ (meaning) to support charities.
I’m ______ (grate) to you for your help.
I often heard her _______(play) the piano in the next room last week.
It is important for us_________ ( protect) the wildlife.
My aunt can’t see anything because of his _________(blind).
My grandmother is badly ill and she needs an _________(operate) at once.
I’m think of _________( join) it.