All Spanish words are fem or mas sometimes both ending in a is fem anything that ends in e is both genders anything ending in o is mas
(1):limpiar
(2):nosotros
(3):los libros son chistosos
(4):563
(5):mi hermano
(6):mariscos
(7):la pierna
(8):un resfriado
(9):piscina
(10):el ropero
I am pretty sure is D. <span />
