Question

Eles mesmo precisam fazer o jantar e precisam fazer isso sozinhos" *
They need to make themselves dinner, and need to do it by themselves.
They need to make dinner themselves and need to do it by themselves.
They need to make dinner themselves and need to do it themselves.
They need to make dinner and need to do it by themselves.

Answer 1

Última alternativa:

They need to make dinner and need to do it by themselves.

Espero ter ajudado!

Answer 2

Resposta:

They need to make dinner and need to do it by themselves.

Explicação:

They (eles) need (verbo precisar) to (preposição) make (verbo criar ou fazer) dinner (jantar) and (conjunção "e") need (verbo precisar) to (preposição) do (forma mais comum do verbo fazer) it (pronome) by (nessa frase significa "por") themselves (them = eles/ selves = proprios).