There is _____ knocking at the door. Go and see who it is.
— Let’s go hiking _________ staying at home, shall we? — Good idea.
— ______ is the library from our school? —It’s quite near. Just go ________ the road.
— Can you tell me ____________? — It happened at 3:00 pm.
— TV was invented in _________ century. — Is that true?
—When _________ personal computers _____________? —In 1976.