选择适当选项，把下列对话补充完整。
Peter: I have some problems. I didn't do my homework.
Mary: You should say sorry to your teacher.
Peter: ________
Mary: You should borrow one from your friend.
Peter: OK. I'm tired and I feel sick.
Mary: ________
Peter: My sister Linda is angry with me. ________
Mary: You should buy a gift for her. I think she'll be happy.
Peter: ________
Mary: You're welcome.
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