He must have had an accident, or he ______ here then.
A. should be
B. would be
C. could have been
D. would have been
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______ from the hilltop, the lake scenery is beyond description.
A. To see
B. Having seen
C. Seeing
D. Seen
The chemist and Nobel Prize winner ______ seriously injured in a car accident.
A. were
B. was
C. are
D. had been
He set the engine of the car ______.
A. going
B. go
C. to going
D. on going
It is strange that she ______ to see her own shortcomings.
A. should have failed
B. has failed
C. fails
D. failed
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