12. The guitar, accompanied by the bass viol, (play, plays) the tune.
13. Joe and his brother always (drink, drinks) too fast.
14. Thelma, as well as her sister, (is, are) good at sports.
15. Neither of my parents (is, are) home tonight.
16. The captain of the two teams (is, are) Dan.
17. Where (do, does) the Chester family live?
18. The golf team and the tennis team (win, wins) every match.
19. Why (do, does) Lisa and Tony disagree so much?
20. Mrs. Stum, together with her neighbors, (has, have) a sewing club.