Mary went to the box office at lunch time, but all the tickets ____out.
—Why can your neighbor know so much about London?—He ____ have been there before.
The new teacher made a good ____ on the students by her rich knowledge and humorous talk.
My parents live in a small village. They always keep candles in the house ____ there is a power out.
—What do you think of his opinion?—Nobody has given me _____ piece of advice.
What is the way George thought of _______ enough money to buy the house?