V. Complete the passage below by using the modal verbs given in the box. Cultural rules in Việt Nam If you want to travel to Việt Nam, you should know about some cultural rules in this country. In Việt Nam, elders are respected, so you (21)__________ be careful when you talk to them. But with younger people, you (22)__________ be too respectful. You also (23)__________ waste food if you go to a restaurant. This is because food is an important part of Vietnamese culture. What’s more, you (24)__________ be late when you have a meeting with someone in Việt Nam, because Vietnamese people are punctual. Isn’t it cool?