________ a chance, we will visitEdinburgh a second time.

It was the third time this term that the teacher________with the naughty student

You should save some money __________ you can buy a gift for your mother.

Although a snowstorm is in store, people are still looking forward _________ the plan to go sightseeing in Lhasa.

This old custom has________ since the 18th century, and remains practically unchanged.