ПОМОГИТЕ ПОЖАЛУЙСТА.

НАЙДИТЕ ПРАВИЛЬНЫЙ ВАРИАНТ.
1.
1)Be careful!The knife is very sharp.You may cut ..... .
a)youself
b)yourselves
c)yourself
2)Do you parents grow vegetables ..... instead of buying them from shops?
a)themselves
b)yourselves
c)himself
3)Shelia doesn't often buy clothes: she usually makes them ..... .
a)herself
b)themselves
c)by herself
4)In a cafeteria people help ..... to the food they want.
a)themself
b)themselves
c)theirselves
5)If we believe in ..... , we can accomplish our goals.
a)ourselves
b)ourself
c)myself