Question

2) Answer the question and substitute the word with a pronome (pronuns)

a) Is your mom talking to your uncle? (yes)

b) Can you and your sister raise funds for the food victims? (yes)

c) Is Carla the cookies? (no)

Answer 1

Você só quer substituir por pronomes? Se sim, aqui estão as respostas:

a) Is she talking to your uncle?
b) Can you raise funds for the food victims? 
c) Is she the cookies 

Ps: Na alternativa c) a sentença não está coerente, provavelmente vc digitou errado. Mesmo assim "Is Carla" poderia ser substituído por "is she". 

Respondendo às questões:

a) Yes, she is talking to my uncle.
b) Yes, we can raise funds for the foof victims.
c) No, she isn't buying the cookies.