Lisa doesn’t know ______ she and her friends can do to help the little boy ______ parents have left their hometown for making money.
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 ________.