Mis padres estan en la sala.
Yo sabré
Tu tendras
Nosotros querremos
Ustedes iran
El hará
Tu seras
Yo estudiaré
Ustedes is formal and should be used when talking to someone you’re not so familiar with, like a stranger, or someone that should be addressed with respect, like an elderly person.
The answer to the second blank is- la serpiente es mas fea de la iguana.