I suggest that he _____, or else he could make things worse.
| A．calm down | B．calms down |
| C．will calm down | D．calming down |
--All students must hand in your exercises right now.
-______ We don’t have enough time to finish them.
| A．It doesn’t make sense. |
| B．You said it. |
| C．Forget it. |
| D．It’s up to you. |
Smoking is one of the ______ cause of cancer, killing millions of people each year.
| A．major |
| B．similar |
| C．appropriate |
| D．casual |
______ his father’s letter, he decided to make a call to him.
| A．Having seen |
| B．Having been seen |
| C．Not having received |
| D．Having not received |
Last week, Susan and David, ______ our university’s student association, met the Chinese guests at the New York airport.
| A．to present |
| B．representing |
| C．represented |
| D．having represented |
John may phone tonight. I don’t want to go out ______ he phones.
| A．in that |
| B．in case |
| C．if so |
| D．what if |