Experts say walking is one of the best ways for a person to _____ healthy.
| A．preserve | B．stay | C．maintain | D．reserve |
The new safety regulations were agreed on after _____ with the work-force.
| A．conference |
| B．participation |
| C．intervention |
| D．consultation |
Our goods with a (an) ________of colors and patterns can meet the demand of customers at different levels.
| A．variety |
| B．category |
| C．amount |
| D．species |
If you want to see the chairman of the department, you’d better make an _________ with his secretary first.
| A．assumption |
| B．appointment |
| C．agreement |
| D．admission |
It was along the Mississippi River _________ Mark Twain spent much of his childhood.
| A．how |
| B．which |
| C．that |
| D．where |
If you have a job, ______ yourself to it and finally you will succeed.
| A．do devote |
| B．don’t devote |
| C．be devoting |
| D．to devote |