情态动词should/ought to/must表建议 — 英语填空题
题目
Tom刚到国外交换学习，他想给即将出国的同学一些建议。请用should, shouldn't 或 must 完成句子：You ___ try some local food — it's delicious. You ___ be polite to your host family; it's necessary. You ___ talk loudly on the bus, because it makes people uncomfortable.