----- Nội dung dịch tự động từ ảnh ----- while he is explaining the lesson. C. talking 18. My teacher doesn't allow us A. talk B. to talk 19. We have plenty of time. We needn't A. hurry B. to hurry 20. I promised on time. I mustn't_ A. be; be B. to be; to be C. hurrying late. C. to be; be D. talked D. hurried D. be; to be
