Swimmers must be very strong in order to build up speed because of the high resistance of the water. Runners, ____, must struggle against the heavy resistance of the air and ground.
Yunnan province in China was attacked by such a terrible drought this early spring ____________few people had experienced before, ____________ made us worry about global climate changes.
Although Tom did not actually get the best scores on every single test, ____________his high scores on the psychological tests____________finally won him his position as the best pilot.