根据语境，用恰当的句子完成对话。
A: Good morning, Mary.
B: Good morning, Helen. Come in, please.
A: Thank you. Your room is very nice. Oh! A bookshelf and many
books. 1______
B: Thank you. I like reading, you know. I think reading can make a
person wise.
A: Did you do well in the English exam?
B: Yes. I just learned I passed the English exam and the result is good.
I have got an "A".
A: 2______
B: Thank you. 3______ Why?
A: We will have a math exam next Monday. I'm afraid I may fail the
exam. So I've come for some help.
B: Don't worry. 4______
A: That's great. Thank you very much.
B: 5______ A friend in need is a friend indeed.
A: That's true. When shall we start?
B: Right now.
