다음 중 어색한 단어가 들어있는 문장은?

1. A good process gives a good result.
2. He loves to listen to classic music.
3. He likes to cook and wants to be a cook.
4. His answer was right, but mine was wrong.
5. How about using a shopping bag instead of a plastic bag?

정답과 왜 틀린지.. 그리고 대신 무엇을 써야하는지 알려주세요.
부탁드립니다.