作業(yè)精靈老師示例：
S1：What's your dream?
S2：I want to be a dancer.
S1：What will you do for your dream?
S2：I will study hard and practise dancing more.
S1：Who's your best friend?
S2：Wang Bing is my best friend.
S1：What's his dream?
S2：He wants to be an astronaut.
