Do ____ you think is right, ____ difficulties you may have.
When I arrived at the company, the manager ______, so we had only time for a few words.
David is such a good boy _______ all the teachers like.
The thief tried to break away from the policeman who ______ him, but failed.
The factory was built in a secret place, around ______ high mountains.
The telephone _______ three times in the last hour, and each time it ________ for my father.