旁白：a,b,c and d are on their way home ,and they are talking about their ideal jobs in the future.(a=Jack,b=Tom,c=Greg,d=Helen)
a:Hi,guys,what do you want to do in the future?
b:I want to become a doctor.
c:Why?
b:Because doctors can save people's lives.What about you,
c:I'd like to become an English teacher.
d:What for?
c:An English teacher can lead the students to know the world.And how about a and
a:I hope I can become a scientist so that I can make rockets.
d:I wish to be a driver.