S-5:set about 开始去做（处理）
A:Where's Tom?
A:汤姆去哪了？
B:He set about his homework after school and hasn't finished it yet.
B:放学后他就开始做作业了，还没做完。
A:I don't know why the teacher assigns so much homework!
A:真不明白老师为什么要布置那么多的作业！
B:That will do him good.
B：都是为他好。
