Answer:
1. Realized/Guilty
2. Played/Returned
3. Were done/Knew
4. Quit/Did
5. Has been/Visited
6. Was/Knew
7. Came/Read
8. Fought/Died
9. Heard/Is coming
10. It had been/Took
11. Entered/Read
12. Left/Started
13. Have not seen/ This sentence should be, "Where have you been?"
(If this is not correct, I apologize. I can't see any other way to answer this.)
14. Had not/Was not
15. Were married/Were
16. Walked/Followed
Explanation:
Always make sure the tense matches throughout the full sentence, paragraph and/or thought.
Always make sure the tense is correct for the time period referenced, whether its past, present or future.