The old woman lives _____ a house _____ a garden.
— Can you tell me ____________? — It happened at 3:00 pm.
— TV was invented in _________ century. — Is that true?
—When _________ personal computers _____________? —In 1976.
—Must I finish my work today? —No, you ____________. You _____________ finish it tomorrow.
I think the Great Wall is _________ unusual wonder in the world.