16: D; hermano mayor
17. B; nuestros
18: A; mi
19: D; tienen
20: A; First person singular (I'm not very sure about this one so feel free to skip it for now)
21: B; tienes
22: A; tus
The heart is the main organ in the circulatory system, the structure primarily responsible for delivering the circulation of blood and transportation of nutrients in all parts of the body. This continuous task uplifts the role of the heart as a vital organ whose normal operation is constantly required.
Carpeta in Spanish means binder in English.
