should/shouldn't建议句型 — 英语情景题

情景对话：补全对话。Tom 牙疼（toothache），Lily 根据健康小贴士给他提建议。每空一词。 Tom: I have a toothache and I feel bad today. Lily: Oh dear! You (1)________ go to see the dentist. Tom: Can I eat sweet food? Lily: No, you (2)________ eat too much sweet food. It's bad for your teeth. Tom: OK. What else (其他的) should I do? Lily: You (3)________ brush your teeth twice a day.