作業(yè)精靈老師示例：
Hello, I'm Tom. This is my bedroom. There is a
bed in my bedroom. There are three T-shirts and
two socks on the bed. There is a schoolbag between
the bed and desk. There is a window behind the desk.
There are two footballs under the desk. There is a
computer on the desk. There are some books beside
the computer. There is a chair in front of the desk.
