The doctor tried his best to save this patient.At last he began ___.
.As I am not feeling well, I really appreciate __________ to take my place.
.John, look at the time. __________ you play the piano at such a late hour ?
.Why __________ put the meat in the fridge ? It’ll stay fresh for several days.
.I wonder how he could __________ not handing in his maths exercises yesterday, for his maths teacher is always strict with his students.
.She was educated at Beijing University, __________ she went on to have her advanced study abroad.