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.
At the foot of the mountain _______.
It was _____ he said ______ hurt me.
I like _____ in the autumn when the weather is clear and bright.
The medical team ______ 5 doctors and 3 nurses was sent to Africa last week.
The boy is ______ to leave home.