—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 have been stuck |
| C．might be stuck | D．must have been stuck |
The microphone enabled them to keep in touch, in other words, it made it _____ for them to contact each other.
| A．likely | B．capable | C．possible | D．probable |
She is making herself ill with _____ over her son's future.
| A．trouble | B．annoyance | C．disgust | D．worry |
When products made in factories _____, they are thrown away as garbage.
| A．come to an end | B．are put to use | C．are used up | D．wear out |
I _____ her not to walk on the thin ice but she would not listen to me.
| A．warned | B．persuaded | C．suggested | D．noticed |
It was clear that the small grocer was _____ people he owed money to.
| A．at the expense of | B．at the risk of |
| C．in the way of | D．at the mercy of |