5. Complete the sentences with should /shouldn't.

(Hoàn thành câu với should / shouldn’t.)

1. When you get help from somebody, you _________ say “Thank you”.

2. You_________ask people for lucky money. It's not good behaviour.

3. You_________make noise when you are eating.

4. Before you visit a natural wonder, you_________leam about it.

5. What_________I do if I get lost?