题目内容：

I sat down at my desk and started writing a letter of thankfulness, but when it came to actually putting the letter into the mailbox... I ______ ...  I couldn’t do it. I suddenly felt a sense of ______ and insecurity (不安).

The letter was to an old teacher with whom I kept in ______ on Facebook. For months, I read about what she ______ on her Facebook page, which helped me to live my life differently. Her volunteer (志愿者) work wasn’t huge. ______, she was doing small, local good deeds. ______, she changed my views on the world and for some reason, I felt I should let her know how her example ______ influenced me.

I could have easily sent her an email, but that seemed not enough for such an important thank-you. That’s why I ended up ______ the letter. But now here I was, standing before the mailbox, unable to put the envelope inside. What was stopping me? It suddenly hit me that I was ______ of being too nice. I guess I felt strange ______ it wasn’t like she was my best friend or a relative. Maybe my ______ was too heartfelt. Thinking this over, I put the envelope in the mailbox ______.

Weeks later I received a message from her. It turned out she was ______ a hard time and my note ______ a lot to her. She said she had no idea she was playing such a big ______ in others’ life.

Not only did this letter make her happier, but her response to it brightened my world and ______ my level of happiness as well. I was so ______ that it had such a great influence on her that I decided to write a(n) ____   letter to someone each month. Now it’s easier for me to ______ the goodness in others and be more ______ for this beautiful life I’m living.

1.A. continued    B. stopped    C. swapped    D. paced

2.A. concern    B. disappointment    C. responsibility    D. power

3.A. mind    B. sight    C. order    D. touch

4.A. set down    B. suffered from    C. packed up    D. gave up

5.A. So    B. However    C. Instead    D. Meanwhile

6.A. Exactly    B. Gradually    C. Fluently    D. Frequently

7.A. greatly    B. rapidly    C. loosely    D. widely

8.A. checking    B. receiving    C. handwriting    D. reading

9.A. confident    B. afraid    C. fond    D. sure

10.A. although    B. while    C. until    D. because

11.A. message    B. agreement    C. present    D. explanation

12.A. sadly    B. officially    C. finally    D. entirely

13.A. turning over    B. giving in to    C. making use of    D. going through

14.A. meant    B. persuaded    C. offered    D. determined

15.A. decision    B. part    C. usage    D. command

16.A. increased    B. forecast    C. expressed    D. recognized

17.A. stubborn    B. lonely    C. excited    D. upset

18.A. congratulation    B. request    C. comfort    D. thank-you

19.A. hand out    B. find out    C. set out    D. put out

20.A. grateful    B. sorry    C. satisfied    D. careful