选词填空，补全对话。 What, How, Where, singer, go to work, He is a, by motor cycle, How does he Amy:  ___________________ does your mother do? John: She is a ___________________. She likes singing songs. Amy: ___________________ does she work? John: She works in an air-conditioner company. Amy: ___________________ does she ___________________? John: She goes to work by bus. Amy: What does your father do? John: ___________________ policeman. He likes helping people. Amy: ___________________ go to work? John: He goes to work ___________________.