.I know everything goes smothly from his________voice on the phone.
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.