---It’s 12 April today. Have they found any useful information about the plane's black box?---Flight MH370? Yes, but it’s difficult to decide where the black box really is.
I don’t know when he______ tomorrow .When he_____ , I’ll let you know.
Tom likes playing _____volleyball, and his sister likes playing______ piano.
The meat smells _____. You’d better throw it away.
---Do you mind my taking this seat? ---______.
There are many tall trees on ______ side of the street.