My friend is a big fan of K-Pop music.

→ My friend is (fond) fond of K-pop music.

2. Tom is interested in reality TV shows. He doesn’t like game shows.

→ Tom is (but) interested in reality TV shows but he doesn’t like game shows

3. She started to work for this volunteer organization in 2010.

→ She has (since) worked for this volunteer organization since 2010

4. The teacher has taught these students for three years.

→ The teacher began (ago) teaching these children three years ago

5. He was taken to the hospital. His right leg was broken.

→ His (so) right leg was  broken so he was taken to the hospital