must与should表示建议和禁止 — 英语填空题
题目
根据句意，从 must, should, mustn't, shouldn't 中选择合适的词填空，每词限用一次。Lily 去医院看牙医。医生对她说："1. Your teeth are bad. You ___ eat too much candy. 2. You ___ brush your teeth twice a day. 3. You ___ touch the doctor's tools; they are not for children. 4. It's late. You ___ go home now, or your parents will worry."