Please help with possessive pronouns

For #2 the choices are: si, es mio si, es suyo si, es suya

For #3 : No, no son tuyas No, no son suyos No, no son suyas

For #5: si, es nuestro si, son nuestros si, es suyo

For #8: No, no son tuyos: son suyos No, no es suyo; es tuyo No, no son suyos; son tuyos