Complete the sentences using the affirmative or negative imperatives of the verbs. (Hoàn thành các câu sử dụng mệnh đề khẳng định hoặc phủ định của động từ.) 1. … videos on your mobile phone at school. 2. Always … to do your homework! 3. … food in class! You should never do that. 4. And always … polite to your teachers, too. 5. … in the science block. Don't run! 6. … songs or listen to them on your phone. 7. And … sports clothes in PE lessons. 8. … to bed late when there's school in the ...