the illness pneumonia, Jackson couldn’t go on teaching.
Readers can __quite well without knowing the exact meaning of each word.
You’d better choose someone______ you think ____ kind and friendly to help you.
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.
To read newspaper before going to bed seemed to me a rule ____.
It's no secret to us, but he alone is in the dark. It means ____.