_A container weighs more after air is put in, ____proves that air has weight.
Beyond _______ stars, the astronaut saw nothing but ________ space.
The headmaster ________for more than two weeks.
The trees must _______three times a week.
There ________a football match in our school this afternoon.
. --Can I help you, sir? --Yes, I bought the radio here yesterday, but it ________.