Which verb form correctly completes this sentence?
es obvio que acá durante este mes y eso causa avalanchas.
nieve
nievo
nieva
nieven

Nieve = it snows.
nievo = it snowed.
nieva = it's snowing.
nieven = is not a spanish word.
So the correct verb is ' nievo ' 
because " Es obvio que nievo acá durante este mes y eso causa avalanchas."
is translated to " It's obvious that it snowed here during this month, and that caused avalanches" 
Even though "Es obvio que nieve acá durante este mes y eso causa avalanchas" sounds better because in english it would be "It's obvious that it snows here and that causes avalanches" and that makes more sense, but in spanish the first one is correct. 
The answer is "nievo"

Im awfully sorry but i believe they taught you about mexico and there's a few things i dont know about them, but i could do this question if you provided those details.

Short paragraph:

la mucama (maid en english) es la encargada de realizar los trabajos de limpieza en un hotel. para limpiar la habitación ella, primeramente, usa una escoba para deshacerce de todo el polvo. luego pasa un trapo con jabón sobre el suelo. además, ordena las camas y, de ser necesario, cambia las sábanas. por otro lado, limpia el piso del baño y enjuaga la poceta con un cepillo. finalmente, limpia las paredes de la ducha con agua y jabón.