Answer:
las clases difíciles
Explanation:
Add an <em>-s</em> to <em>clase</em>, and add an <em>-es</em> to <em>difícil</em> because adjectives have to match the plurality of the word they describe.
3-Toca
4-Ayudamos
5-Trabajan
6-Patinan
8-Dibujan
9-Nada
10-Practican
Un catarata is a waterfall, so I'd say TRUE
“Estamos lavando la ropa.”
HOPE I HELPED!