—I wonder why Mr. Green hasn't showed up at the meeting yet.
—I'm not sure, but he __________ in a traffic jam driving here.
| A．could be stuck | B．might stick |
| C．might have been stuck | D．must have stuck |
If there is a lot of work ________， I'm happy to just keep on until it is finished.
| A．to do | B．to be doing |
| C．done | D．doing |
To learn English well, we should find opportunities to hear English ________ as much as we can.
| A．speak | B．speaking | C．spoken | D．to speak |
A cook will be immediately fired if he was found ________ in kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |
If you are in trouble，Mike is always willing to________a hand.
| A．lend | B．shake | C．wave | D．want |
My uncle hasn't been able to quit smoking，but at least he has ________.
| A．cut out | B．cut down |
| C．cut up | D．cut off |