simple present

1.-Sara _________what to do
a)don´t know
b)doesn´t know
c)doesn´t knows

2.-Will __________ to do shopping
a)doesn't like
b)don't like
c)don't likes

3.-My grand father __________ in Mexico
a)doesn't lives
b)don't live
c)doesn't live

4.-My brothers __________ to school everyday a)walkes
b)wolks
c)walk

5.-Carlos __________ breakfast at half past seven (
a)has
b)have
c)haves

6.-My cousin __________ chemistry
a)studies
b)study
c)studys​