20. "What can I do for you?" or "May I help you?" is a pet phrase used by _____ .
It has been announced that candidates ______ remain in their seats until all the papers have been collected.
— Is John coming by train ? — He should, but he ______ not. He likes driving his car.
— I hear you’re got a set of valuable Australian coins. ______ I have a look ?— Yes, certainly.
He hesitated for a moment before kicking the ball, otherwise he ______ a goal.
Mr. Bush is on time for everything. How ____ it be that he was late for the opening ceremony ?