She studies ___ medicine before she turned ___ writer.
The best job is_______which uses your skill in doing something together with your interest in the subject.
——There must be a dozen pens in this house but I can never find one when I need one.——Keep looking. ______is sure to turn up.
Who can you turn to in time of danger, it not ________.
——Which of the two books do you want?—— I want_______. Please show me________.
Some people would rather ride bikes as bike ridding has_________ of the trouble of taking buses.