-Is this kind of digital camera made of steel?-Yes, and it's widely used ______ taking photos.
______ this rock , please. I’m afraid some people can’t stand the noise!
Their school days are busy and the children don’t get home _________ 7 pm.
Let’s ________ for a walk, shall we?
—A ruler is 2 dollars and a pen is 3 dollars. How much are they? —They are ________.
—______ is your father? —A bank clerk. He works in a bank near my home.