The scientists ________ on the new medicine for two years. They will succeed in no time.
| A．work | B．are working | C．have worked | D．will work |
The cleaners must keep the street _____.
| A．from getting dirty | B．to dirty |
| C．to get dirty | D．getting dirty |
We must plant more trees after we _____ every year.
| A．cut off them | B．cut them off |
| C．cut down them | D．cut them down |
_____ everybody likes watching TV in my family. My parents like doing outdoor activities.
| A．No | B．Not | C．None | D．Nobody |
—Hi, Bob! I can’t find my story book. Have you seen it?
—Sorry, I haven’t. Why not ask Jim? Perhaps he’s seen it _____.
| A．anywhere | B．everywhere |
| C．nowhere | D．somewhere |
The driver was badly hurt _____ of the traffic accident.
| A．at a result | B．in the result |
| C．with the result | D．as a result |