-- Have you seen ______pen? I left it here this morning
-- Is it ______black one? I think I saw it somewhere
| A．a；the | B．the；the | C．a；a | D．the；a |
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 |