Congratulations______you, Tom. You did the best.—Thank you.[]

Last month, doctors used a 3-D printer to rebuild the face of a person ____ had a bad accident.

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 think this is ______ useful book.

Which is the way the post office? [ ]