37. The boy is curious _____ everything. I am sure he is very clever.
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 .