Esta trabajando is the answer
2) Yo creo que comida Mexicana se escucha apetitosa por toda la buena comida que tiene, como tacos, burritos y Cemitas
3) Si yo tuviera tres alimentos de paises con culturas hispanas que yo pudiera elejir a mi me gustaria probar algo que nunca e comido como Paella, Empanadas, y Crema Catalana
Those are just some corrections I think were a bit off but if you don't want to change them then I don't think you have to although I do think you should :)
1. Eres
2, 12, 14. Somos
3, 8, 11, 18, 19, 21. Son
4, 20. Soís
5, 6, 7, 10, 13, 15, 16, 17, 22. Es
9. Soy