____ a career, you’d better considerall the possible respects

Some of us fail to learn that pain is the body’s way of informing the mind ______ we are doing something wrong, but not necessarily ______ is wrong.

The final round of the competition is coming near. Can I really do well this time —Believe in ______. You’re always the best in our school.

The old man is still eager _______ work, for he can’t imagine life without it.[ ]

The headmaster has got a good education ___so the school is doing well.