a writer,writing stories,a doctor,try his best,The Old Man and the Sea,want to be,be good at doing sth.,keep on doing sth.,write stories,be sure about,make sure,try ones best/ do ones best,medicine,grows,practice,engineer,sure,their,writing,scientist,pianist,wants,What do you want to be when you grow up?,How are you going to do that?,Betty is going to practice singing every day.,When are you going to work?,Make sure that you will try your best.,B,A,A,D,A,C,B,D,D,C,A,A,A,A,D,
