Robert is said _______ abroad, but I don’t know what country he studied in.
| A．to have studied | B．to study |
| C．to be studying | D．to have been studying |
—Tom came to work last Friday ,but no one has seen him since.
—he have had an accident ?
| A．Should | B．Must | C．Might | D．Could |
—I telephoned him twice and I couldn’t get through to his home.
—I think the line might have been out of order, ________?
| A．don’t you | B．wasn’t it | C．do you | D．hadn’t it |
—It cost me 30 yuan to get here.
—Well, it was crazy of you to take a taxi _______ you could come by bus as well.
| A．while | B．if | C．when | D．because |
—Will you go shopping now?
—Not until I ________ my experiment.
| A．have finished | B．will finish | C．finished | D．had finished |
Every child is _____ to it parents.
| A．precious | B．possible | C．expensive | D．valuable |