1. headache
根据对话内容：
Su Hai: I have a headache. I feel cold. （苏海：我头痛。我觉得冷。）
可知，本空为headache.
2. anything
根据对话内容：
Mike: I have a toothache. I can't eat anything! （迈克：我牙痛。我什么都吃不下!）
可知，本空填anything
3. shouldn't
根据对话内容：
Dentist: You shouldn't eat too many sweets. You should brush your teeth in the morning and before bedtime. （牙医：你不应该吃太多甜食。你应该在早上和睡觉前刷牙。）
可知，本空填：shouldn't
4. sweets
根据对话内容：
Dentist: You shouldn't eat too many sweets. You should brush your teeth in the morning and before bedtime. （牙医：你不应该吃太多甜食。你应该在早上和睡觉前刷牙。）
可知，本空填：sweets
