The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
| A．while | B．when |
| C．as | D．until |
Although the causes of cancer _____, we do not yet have any practical way to prevent it.
| A．are being uncovered |
| B．have been uncovering |
| C．are uncovering |
| D．have uncovered |
At this time tomorrow ____over the Atlantic.
| A．we’re going to fly |
| B．we’ll be flying |
| C．we’ll fly |
| D．we’re to fly |
Susan decided not to work on the program at home because she didn’t want her parents to know what she_____.
| A．has done |
| B．had done |
| C．was doing |
| D．is doing |
----Did you tell Julia about the result?
-----Oh, no, I forget. I _____her now.
| A．will be calling | B．will call | C．call | D．am to call |
After the long journey, the three of them went back home, ______.
| A．hungry and tiredly |
| B．hungry and tired |
| C．hungrily and tiredly |
| D．hungrily and tired |