13. Tú repites
14. Ella compra
15. Nosotros ocurrimos
16. Yo ando
17. Ustedes beben
18. El deber
19. Usted llama
20. Ellas viven
21. Ellos creen
<span>Él es un compañero de clase is the right answer. The 1st sentence is ella but </span>compañero should be compañera. In the second one ella should not have an accent mark and in the last one el doesn't match with una.
Buy tickets for your sister
Answer: amigos
hope this helps
