—It was careless of you to have left the house without turning off the gas.—My god! _______.
When you are home, give a call to let me know you __________ safely.
Tom __________ in the library every night over the last three months.
—I remember you were a talented pianist at college. Can you play the piano for me? —Sorry, I __________ the piano for years.
In order to find the missing child, villagers __________ all they can over the past five hours.
During the last three decades, the number of people participating in physical fitness programs __________ sharply.