.It was obviously that the man ______ driving on the free way for almost an hour when he ______ that he must come back.
Look! There are people in the supermarket.
What are people supposed to do when they meet ________the first time? —They are supposed to bow. [ ]
He plays basketball so well! Who taught _______?—He learnt it by _______.
_____do you go to the library?－Once a week.