I believe descubrámoslas is correct
It’s asking to fine the thing that’s is considered a material. For example, the first question you underlined “baloncesto” which means basketball. The next one would be “perro” which means ball. The next one would be “casa” which means house and so on.
Mañana yo voy a la iglesia
A.Voy
1. I live
2. You live
3. He lives
4. She lives
5. You live (formal)
6. We live
7. y'all live
8. they live
9. they live
10. the woman lives
11. the grandma lives
12. Paco and Ana live
13. i can't see
14. My family and I live
15. The man lives
