---Did you go to the fashion show last week？
---I_________，but I was fully occupied the whole week．
A. must go B. must have gone
C. would go D. would have gone
I would have come earlier, but I _____ that you were waiting for me.
A. didn’t know B. hadn’t know
C. would have known D. haven’t known
Had I known about this computer program, a huge amount of time and energy .
A．would have been saved
B．had been saved
C．will be saved
D．was saved
_______the thick clouds, you would find the kite in the sky easily.
A. Had it not been for
B. If it were not
C. If it had not been for
D. Were it not for
Experts say ________ to sunlight for too much time will do harm to one’s skin.
A. exposed B. having exposed
C. being exposed D. exposing
—What about the student in your class, Mr. Wang?
—The doctor said that sleep caused him poor memory and poor concentration.
A．lacking of B．lacked in C．lacking D．lack for
