根据短文内容填入适当的单词，使短文的意思完整，每格限填写一个英语单词，要求开头第一个字母与所给的字母相同。在填写答案时，单词开头的第一个字母要写出来。

Dear Tom, 

      Are you surprised to hear from me? I have not heard from you s   1     the beginning of the summer h   2   .

How are you getting on with your s    3    ? How are your parents? Is your brother Bill b   4    f    5     Canada

yet?

      My stamp collection (集邮) is g   6     bigger and bigger. I have collected stamps of more than forty d   7    

countries. In my stamp books, I usually put the stamps from each country together. I have got a pen-friend

from Britain. She gave me some B   8    stamps. My American teacher has given me some beautiful American

and Canadian stamps. I'm glad to know you are going to give me some foreign stamps, but I still have not r   9   

the stamps of Nepal which you said to p   10    me. Have you sent them off yet?

      Please write to me soon. 

                                                                                                                                            Yours,

                                                                                                                                            Zhou Wen

1.                2.                 3.                 4.                  5.                

6.                7.                 8.                 9.                  10.             

忠诚客户对企业的促销和减价等营销措施不敏感，他们常常全额购买企业的产品和服务。忠诚客户给企业带来经济效益的方式是（）。

A.购买升级

B.重复购买

C.关联消费

D.溢价消费