_ twice a year, whether itis a car or a bus or a truck, is the rule that every driver must obey in thiscity

What are you going to do with so many vegetables—Well, ______ allow them to go bad, I will sell themat half price.

We got to the top of a mountain _________we can see the whole city.

_____ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home. [ ]

They were singing and dancing to _____ their high spirits though it was very cold.