When he was young, he used to __________ hard at his lessons.
| A．devote to working | B．devote himself to work |
| C．be devoted to work | D．be devoted to working |
A left-luggage office is a place where bags ________ be left for a short time, especially at a railway station.
| A．should |
| B．can |
| C．must |
| D．will |
—I heard that they went skiing in the mountains last winter.
—It ________ true because there was little snow there.
| A．may not be |
| B．won’t be |
| C．couldn’t be |
| D．mustn’t be |
—Who is the girl standing over there?
—Well, if you ________ know, her name is Mabel.
| A．may |
| B．can |
| C．must |
| D．shall |
You and I could hardly work together,________?
| A．could you |
| B．couldn’t I |
| C．couldn’t we |
| D．could we |
—It’s the office! So you ________ know eating is not allowed here.
—Oh, sorry.
| A．must |
| B．will |
| C．may |
| D．need |