Запишите 10 предложений на что должны делать дети на уроке языка

1. Children must be calm.
2. Children must must be attentive.
3. Children must do their tasks.
4. Children must answer teacher's questions.
5. Children must speak English.
6. Children must use textbooks.
7. Children must be dilligent.
8. Children must learn new words by heart.
9. Children must write down new words and rules in their copy-books.
10. Children must try their best to master English.