5. Los alumnos estudiaban para el examen
6. Los niños y yo miramos la tele
7. Tu eras guapo
8. Yo trabajaba los fines de semana
9. Juanita esperaba el autobus
10. La gallina es mas grande que el pollito
11. El tigre es menos tonto que el burro
12. El hipopotamo menos alto que la jirafa
13. La araña es mas pequeña que la iguana
14. menos alto que
15. mayor que
16. este
17. menor que
18. estas
19. idk about this one cause it didn't really make sense to me but i think is "ese"
20. bebia
21. vivian
22. iban
23. eran
The second choice is correct.
Could it be, "calor" which means it is hot
The answer is A. Tú tocas el piano. Because Tu tocas is the only correct way of saying you are playing the piano in this instance. C is saying "tocan" which is wrong because it's saying you but then using a the group form of playing. The same thing with B, it's also using the group form of playing and it's past tense. And D is using the I form of playing not the you form.