[解析]
ACB
W:Hello,Martin.How are your preparations for the coming exam?
M:Good,Miss Davis.I've worked hard recently.I think I'm ready for the coming exam.
W:Excellent!So,are you working at weekends now to get some pocket money?
M:Yes.I must thank Mr Lam.He really helped me with my problem.
W:Mr Lam said that your problem was that you had no pocket money.
M:That's right.I couldn't go out with my friends because I didn't even have the money for the bus.But I'm OK now with a part﹣time job.
W:So,how will you spend your extra pocket money besides that?
M:Oh,I'll buy my mother a birthday cake.
W:You must love your mother very much.
M:Of course,she is kind and hard﹣working.So I want to thank my mother as well.
W:You are great,Martin.