[解析]
13.A14.C15.A
W:Hi,David.Congratulations!You came first in the Math test.But why are you so sad?
M:Hi,Millie.I failed in the English test.Can you give me some suggestions on how to learn English well?
W:Of course.First,you should listen to the teacher carefully in class.
M:Got it.I'll take notes while listening.What else?
W:Second,you should ask teachers or friends for help if you have problems.Last but not least,you need to practise more.
M:That's very kind of you.Thanks for your suggestions.I will try them.
W:You are welcome.I'm sure you will make progress soon.