—Are you free after school? —Sorry. I’ve planned to treat a friend of mine to dinner ________for his help.
Every four years athletes from all over the world _____the Olympic Games .
------Did you get a ticket? -------No. I______, but there wasn’t any left.
They have decided to show the children around the small town because the brightly colored houses there appeal _____ children .
The newly published book , which refers ____ basic English grammar , is ____ only for beginners .
The visit of the police was _________ the lost child .