--- What do you think of pollution of the big factory?--- It’s a serious problem. We should _____ all the people to do something for it.
He has no money to buy a house, so he wants ______ one ______ his friends.
Our English teacher is_______ the classroom.She is writing on the blackboard.
_________ boys are there in our class?
There _____ a pen, two pencils on the desk.
—Lily, here are your pens. Please _____. —OK, Mom.