6. p________：a system of fixed rules and formal behavior used at official meetings

p________ : a system of fixed rules and formal behavior. used at official meetings

7. c________：polite, especially in a way that shows respect

8. m________：a unit that can form part of a course of study, especially at a college or university in Britain

9. h________：the act of tormenting by continued persistent attacks and criticism

10. w________：the amount of work that has to be done by a particular person or organization

1. The U.S. Postal Service is enhancing the mail experience nationwide with Informed Delivery -- an optional notification service that provides eligible residential consumers with a digital preview of their household's mail.

3. The expectations are high and heterogeneous, so we have to watch customer needs carefully. And we do not tell the customers what they need, they tell us and we then help make their lives easier through the Post.

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