She _____ your birthday party, but she had to look after her mother in hospital．
A．should attend B．ought to have attended
C．can have attended D．must have attended
A survey of China's citizens found that some smokers are unwilling to kick the habit because they aren't fully ____ of the harm it does to health．
A．fond B．ashamed C．worthy D．aware
____ is clear ____ the Diaoyu islands have been China's inherent territory （固有领土）both from historical and legal aspects since ancient times．
A．That; that B．This; this C．It; that D．What; what
—How was the journey?
—Tiring! I caught the train at the last second but all the seats _____．I stood all the way．
A．would occupy B．had occupied
C．had been occupied D．would be occupied
I was standing behind a tall man．When the man looked _____, I recognized him at once．
A．up B．down C．forward D．about
____ we get on well with a number of people , we are usually friends with only a very few．
A．As B．Once C．Before D．While
