–Where are the students? How could they keep us waiting for so long?
–They started an hour ago and they ____ be here in fifteen minutes, I think.
| A．can | B．would | C．should | D．must |
There was something wrong with the network, or the e-mail____ earlier.
| A．could have been sent | B．might be sent |
| C．need have been sent | D．must be sent |
I’d rather have a room of my own, however small it is, than _____one with others.
| A．share | B．sharing | C．to have shared | D．to share |
_______ she was invited to the ball made her very happy.
| A．Whether | B．Because | C．What | D．That |
Tom was over there. His red clothes stood out clearly _____the snow.
| A．behind | B．for | C．against | D．beyond |
Mike did the homework _______ it took me.
| A．one-third a time | B．one-third the time |
| C．a one-third time | D．one-third time |