Someone called me up at midnight, but he had hung up I could answer the phone.
A. as B. since
C. until D. before
__________ Beijing Opera to the basic education in China is a big step to promote traditional art.
A. Adding B. Added
C. Add D. Having added
I___________ toward the door to go outside when suddenly Jim opened it unexpectedly.
A.had been waking B.had walked C.walked D.was walking
Mr. Brown arranged for the taxi to come at eight ___________ he could arrive at the airport on time.
A.in case B.even if C.so that D.as though
—Why can't you go with me to the National Museum?
—I ___________ an essay all the morning and haven't finished yet.
A. write B. had written
C. will write D. have been writing
Sometimes it seems that doors ___________ be closed for you, but remember, they are not all locked.
A.must B.should C.may D.need
