Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
Helen is much more kind to her youngest child than to the others,___________ of course, make the others unhappy.
--____________?--He is tall and strong.
She suggested to the police in the police station that__________.
I told you that you shouldn't waste your time playing the computer games,_____________?
Towards ___________ morning, _________ heavy snow began to fall.