If the boy had _____ the dog alone it wouldn't have bitten him.
I’ve been away for only three years, _____ I can hardly recognize my hometown
In China, you _____ vote when you are 18.
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
Many workers were organized to clear away remained of the World Trade Center.
A survey was carried out on the death rate of those who were infected by SARS, ________were surprising.