Cambiar de singular a plural these teeth hurt me?

Ejercicio 1

a) This

b)That

c)That

d)Those

e)This

f) This

g)This

h)This

i)Those

Ejercicio 2

a)These children like chocolate

b)Those women paint the house

c) This tooth hurt me

d)Those mouses are big

e)That potato is expensive

f)These men are important

Ejercicio 3

a) Mario and Nancy

b) Mario is a mechanic

c) Nancy is an accountant

d) His hair is short, curly and blond, his eyes are brown and he is tall

e) His eyes are brown.