I. 1. deal with

   2. in person

   3. influence

   4. in public

   5. to take up

   6. was proud of

II. 1-4 BCAD

III. 1. has changed

     2. used to be

     3. don’t have; anymore

     4. give up

     5. Did; use to; did

IV. One possible version:

Great changes have taken place in people’s life in the past 10 years. People used to keep in touch with friends by sending letters, but now the telephone, mobile phone, QQ, e-mail and WeChat are more convenient and widely used by people. They got information by listening to radios, now they can get information by TV or the Internet. People walked out or took a bus to work. Now they can drive their own cars to work or take a subway if they want. People used to pay in cash but now they pay by credit card. Most young men are used to paying by their smart phones. Families used to share small rooms. Now they can live in apartments with several rooms. With so many great changes in life, people feel happier and happier now.