I had just taken a bite of my hot dog ________ I heard a familiar voice yelling at me from across the crowded school yard.
| A．before | B．while | C．since | D．when |
When you do exercises, your heart works better. It is able to______ more blood while beating more slowly.
| A．produce | B．pump | C．increase | D．bump |
Before the final examination, many students have shown ____ of tension. Some have trouble in sleeping while others have lost their appetite.
| A．anxiety | B．marks | C．signs | D．remarks |
It’s bad ____ for a man to smoke in the public places where smoking is not allowed.
| A．behavior | B．action | C．manner | D．movement |
One-room schoolhouses can still be found in _____ areas where there are no other schools for many miles.
| A．disposed | B．deserted | C．isolated | D．abandoned |
The old man got into the _____ of storing money under the bed.
| A．tradition | B．habit | C．use | D．custom |