1.assistance n. 帮助.协助
A: Can I be of any assistance?
B: I guess I'd better do it all by myself, but thanks anyway /thank you all the same.
2.comfortable a. 舒适的
A: It's nice of you to come and see me. Do sit down and make yourself comfortable.
3.grateful a. 感激的
A: I'm very grateful to have your company.
B: You're welcome.
4.gratitude n. 感激
A: I'd like to express my gratitude far the nice evening.
B: I'm glad you liked it.
5.indebted a. 感激的，蒙恩的
A: I'm very much indebted for having troubled you.
B: That's all right.
6.mention v. 提及
A: I really can't thank you enough.
B: Please don't mention it.
7.million n. 百万
A: Thanks a million!
B: I'm only too glad to he able to help you.
8.position n. 位置
A: You're really a life saver. How ran I ever thank you?
B: You would have done the same in my position.
9.service n. 服务
A: It's ever so nice of you to give me so much advice.
B: At your service.
10.sweet a. 甜蜜的
A: Honey, it's so sweet of you to have cooked dinner.
B: That's OK，I happened to be free.
11.thoughtful a. 周到的
A: It's most thoughtful of you to have bought a ticket in advance.
B: It's my pleasure.
12.understanding a. 理解的
A: You are most understanding to be so flexible. Thank you.
B: The pleasure is all mine.