_____ in writing a lecture speech on Chinese History, he didn’t hear anybody knocking at the door.
A good storyteller must be able to hold his listeners’ curiosity__________he reaches the end.
The fire was finally brought under control,but not __________heavy damage had been caused.
.Most students used to listen to their teachers in class and completely obey their teachers,__________?
—Why is Tom absent? —He must be sick,__________?
I don’t think he could have done such a stupid thing last night,__________?