用恰当的情态动词完成下列句子
1．As a doctor, you ________ try your best to cure your patients.
2．In some parts of the world, you ________ boil the water before drinking it.
3．He ________ have stayed at home this morning. I saw him shopping in another city.
4．You ________ smoke in this part of the hospital.
5．You ________ keep a simple first aid box at home for any accidents.
6．You ________ take care of yourself when I'm away.
7．—You ________ have finished the article. The deadline is last Friday.
—Sorry. I have been busy these days. Could you give me three more days?
8．He ________ have caught a bad cold last night, for his forehead felt burning.
9．You ________ walk so fast; we have enough time to catch the early train.
10．—________ I do that right now?
—Yes, you must.
