Which of the following sentences have the compound-complex structure?
1 After I worked in my garden all day, I was extremely exhausted, so I took a nice long nap.
2 Mr. Benson likes to read the textbook, study the workbook, and memorize the glossary.
3 Dr. Nelson installed a fish tank because he enjoys fish, but his staff does not like the new tank.
4Jorge wanted to do well in school, so he quit his job because he needed more time to study.
5 Sadly, Patricia's dog Arnold ran away from home last week, and he never returned.
6 After Robert comes home from work each evening, he remembers to check his mailbox.