Readers are required to _________ the rules of the library and mind their manners.
I must find out why____so many students made the same mistake.
It was announced that only when the fire was under control to return to their homes.
Mum is coming. What presentfor your birthday?
— Do you think George has passed the driving test? — No. If so, he ____ _his car to our college yesterday.
Is it in the factory__ you visited last week__this kind of car is made﹖