Mr. Liu born in a poor family, _____a lot of suffering when still a child.

Bad habits are no way easy to be ______; it needs your determination and perseverance.

-- Have you each got a computer in your office?-- Of course.        of our work           by the computer.

-- Why was Mr. Wang so happy this morning?-- Because he was ______  a large sum of money for his creative achievements in teaching.

He came to my class every week, but his attitude ________ he was not really interested in the subject.