Answer:
the awnser is the first one (se tiran a la basura)
1) the teacher 2)Rita and Carmen 3) Elena and I I don't know 4 & 5 sorry
yes they both should be feminine it should be
Mi abuela es argentina
The conjugation is van for ellos/ellas
Other IR conjugations:
yo voy : I go
tú vas: You (informal) go
él/ella/ello/uno va : He/she/one goes
usted va: You (formal) go
nosotros vamos :We go
vosotros váis : You all (informal) go
ellos/ellas van : They go