当你把琼斯老师介绍给妈妈时,应说: A. I'm Mr Jones. B.Mom,this is Mr Jones. C.Hello, Mr Jones.
---____________ is your shirt? ---It’s black and white.
There __________ some books and a clock on the desk. The clock ________three hands.
---Excuse me, do you have any erasers? ---__________________.
---What can you see in the bag? ---______________. Oh, they are pencil-boxes.
There aren’t ____________ pears __________ the tree.