When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.
| A．broke off | B．broke down | C．broke out | D．broke away |
When she realized I _________ her, she quickly made a pose, smiling.
| A．was photographing | B．photographed |
| C．had photographed | D．will photograph |
Only when your identity has been checked _________.
| A．you are allowed in | B．you will be allowed in |
| C．will you allow in | D．will you be allowed in |
Don’t just sit there ________ your legs; come and help me carry the box upstairs.
| A．swung | B．to swing |
| C．swinging | D．and swinging |
_____ to sunlight for too much time will do harm to one’s skin.
| A．Exposed | B．Being exposed |
| C．Having exposed | D．Exposing |
—What clothes should we wear to attend the ball?
—Dress ________ you like.
| A．whatever | B．no matter what |
| C．however | D．no matter which |