The number of smokers in the countryside is usually greater than _______ in cities.
The open-air celebration has been put off __________ the bad weather.
While __________ for the bus, I happened to come across my childhood friend, Tom.
__________ win the most gold medals in the 2012 Olympic Games, the Chinese athletes are busy training.
The boy’s father insisted that the boy ______ badly and that he ______ to the nearest hospital at once.
In that terrible earthquake, ______ who were killed ______ more than 20,000.