Do you have any plan for this summer vacation, Mary?— Sure, I’ d like to be a volunteer and help to ______ the Central Park.

She has written a lot of books, but_______ of them is good .

_______ children in Africa have little food to eat, and we can help them.

He was _____at the news and looked at me with his mouth _____.

People usually work the day and sleepnight. [ ]