I have to see the doctor because I __________ a lot lately.
| A．have been coughing | B．had coughed |
| C．coughed | D．cough |
It is nice to see millions who had nothing but a record of misery and hungry ______ to improve their life and living conditions.
| A．having the chances | B．have the chance |
| C．to have the chance | D．had the chance |
With the Internet use ______ in the world, companies like Yahoo and Google are hunting harder for deals.
| A．exploded | B．having exploded | C．being exploded | D．exploding |
So much of interest ______that most visitors simply run out of time before seeing it all.
| A．offers Beijing | B．Beijing offers |
| C．does Beijing offer | D．Beijing does offer |
You _______ an A on your term paper, but you quoted a little bit more from others' papers.
| A．should receive | B．could have received |
| C．would receive | D．must have received |
Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.
| A．while | B．because | C．unless | D．if |