____ speaking, a person must care much about his ____, because it is not only a personal thing, but also a social one.

If you want to see the chairman of the department, you’d better make an _________ with his secretary first.

The manager of the company told us that very little ________ was made of the waste material in the past.

—Paul has gone abroad to try his luck.—In my _______, his decision is not wise.

Companies are struggling to find the right _____between supply and demand, but it is no easy work .