Though he failed, he tried _______ it again and again.
Computers are of great to the development of science and technology.
The child should be punished. You shouldn’t let him ______ telling lies.
— We haven’t heard from Jane for a long time.— What do you suppose ______ to her?
He is looking forward __________his father.
It’s the ________ in Britain for a bride to throw her flowers to the wedding guests.