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.
The hostess of the party, who ______ as a doctor for five years, is president of a famous private school.
Of the two brothers, Bill is ____ younger one, and he is a quiet boy, _____ that most adults like very much.
The officials soon realized that, _________, things would get worse.
Great changes have taken place in that school. It is no longer ______ it was 20 years ago, _____ it was so poorly equipped.
Hearing the dog barking fiercely, away ____________.