---Have you heard about Volunteer? ---Sure, A volunteer is someone _________ is willing to offer help without being paid..
I had a little trouble in English grammar.
This book is very ___________ and I am ___________ in it.
He has ____ for ten years.
–What do you think of the man? --I find _____ difficult to work with him.
–Did you go to Jack’s birthday party? -- No, I ________.