The dying old man opened his mouth as if_______something.
In such a fierce competition, a person has to make every effort if he_______.
--How often do you eat out? --______, but usually once a week.
We’d like to arrive half an hour early________ we can have time for a good rest.
To keep healthy, Mr. Smith_______ cycling as a regular form of exercise after he retired.
There are_____ large number of people there, so we soon lost____ sight of him.