—Why do you look worried?
—Fred left the company half an hour ago. His work ________ unfinished since.
| A．left | B．was left | C．has left | D．has been left |
30.—Why did you leave the lights burning?
—Heavens! I guess I__________to turn them off.
| A．would forget | B．had forgot | C．forgot | D．have forgot |
35. —Did you attend David’s wedding last night?
—No. I ________ before that.
| A．wouldn’t have been invited | B．didn’t invite |
| C．wouldn’t invite | D．hadn’t been invited |
34. The man showed us so heavy a stone _______ no man can lift.
| A．that | B．as | C．which | D．And |
33. To improve your reading ability, you should ____ half an hour every day for learning new vocabulary.
| A．leave out | B．take up | C．set aside | D．focus on |
32. This disaster ______ that people had no knowledge of first aid and they hadn’t known how to protect them-selves in face of danger.
| A．led to | B．contributed to | C．resulted in | D．lay in |