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2. We shouldn't leave without saying goodbye.
3. You shouldn't throw your litter onto the street.
4. There should be more than seven candles on the cake.
5. The students shouldn't use their mobile phones in the exam.
6. We should go to the new restaurant on Truong Dinh Street.
7. You shouldn't leave your shoes here or people will step on them.
8. When someone does you a favour, you should say thank you.
9. We should eat more vegetables and drink more water.
10. You should ask the teacher for help if you don't understand the lesson.