Younger adults who get either little sleep or a lot of it ________ see a greater expansion in their waistlines over time.
A. may B. must D. need D. shall
—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 |