Answer:
1. While the most common American greeting is a handshake, the Japanese most often bow to say hello. (subordination)
2. I love to use Twitter as a way of expressing my thoughts. I would tweet my whole life if I had the time. (period capital)
3. Amy loves to read, and she reads lots of novels in her spare time. The library is her favorite place. (comma + coordinating conjunction) / (period capital)
4. Mr. Johnson used to teach English in Richmond Middle School; I used to be a student there. (semicolon)
Explanation: