다음 대화의 빈 칸에 알맞은 말을 골라 봅시다. (1점) A: Internet shopping is very convenient. Do you agree? B: No. ____________________ A: Really? Why not? B: It's not safe to buy things on the Internet. ① I really think so. ② I can't agree with you. ③ I agree with you. ④ That's just what I was thinking. ⑤ I think it can save time.