Some policemen should be sent to _______ them _______ the animals.
| A．prevent; to kill | B．stop; killing |
| C．keep; to kill | D．keep; killing |
—Thank God you're safe ！
—I stepped back Just __________ to avoid the racing car.
| A．in time |
| B．in case |
| C．in need |
| D．in vain |
Dina,__________ for months to find a job as a waitress，finally took a position at a local advertising agency.
| A．struggling |
| B．struggled |
| C．having struggled |
| D．to struggle |
__________ in the queue for half an hour, the old man suddenly realized he had left the cheque in the car.
| A．Waiting |
| B．To wait |
| C．Having waited |
| D．To have waited |
__________ at my classmates' faces, I read the same excitement in their eyes.
| A．Looking |
| B．Look |
| C．To look |
| D．Looked |
__________ is known to everybody , light travels faster than sound.
| A．It |
| B．As |
| C．That |
| D．What |