__________twice a year, whether it is a car or bus or a truck, is the rule that every driver must obey in this city.
I think it a great honor ___________ to visit your country.
— What do you think of modem music? — It is often considered not as good as ___________ of the past.
Students ___________ remain in their seats until all the papers have been collected.
__________strong earthquake struck __________ Yaan, Sichuan province on April 20, 2013.
―Hey, you haven’t been acting like yourself. Everything is OK? ―_________.