To keep healthy, Professor Johnson __________cycling as a regular form of exercise after he retired.
He is believed____________ in at his office on his way home.
The boss____________ the worker how to do it, or the accident couldn't have happened.
Don't be joking. It's time to____________ your business.
It may not rain, but you had better take an umbrella__________.
I'd like to be a professional singer, but I don't think I've got ________.