用must, have to, can, ought to, need, should的适当形式填空。
You ________ keep your promise.
In some parts of the world, you ________ boil the water before drinking it.
He ________ stayed at home this morning. I saw him shopping in another city.
You ________ smoke in this part of the hospital.
You ________ keep a simple first aid box at home for any accidents.
You ________ take care of yourself when I’m away.
—You ________ have finished the article. The deadline is last Friday.
—Sorry. I have been busy these days. Could you give me 3 days more?
He ________ have caught a bad cold last night, for his forehead felt burning.
You ________ walk so fast; we have enough time to catch the early train.
—Need I do that right now?
—Yes, you ________.