I have tried to solve the problem, but it is so difficult that it ___ not only me but also my friend.
I hoped Tina _________ to my birthday party next Thursday.
Several months later, he found Mr. Jackson very difficult ________.
I’ll never forget the place _________ I visited nine years ago.
—John isn’t a football coach, is he?—__________.
School children must be taught how to deal with dangerous ________.