John kept looking at the pretty girl, wondering whether he_________ her somewhere.
---Cliff, I lost your bike at school. I suppose I should pay for it.---Oh, ______. It was an old bike anyway.
---Could you tell me the way to the zoo?---Follow me, please. I happen ______ there, too.
---Who is making so much noise in the garden?---______ the children.
Historically, ______ main material for making tables has been wood, but ______ metal and stone have also been used.
While in London, we paid a visit to the hospital founded__________the nurse Florence Nightingale.