Bài 8: Điền động từ khuyết thiếu “must” hoặc “have to” vào chỗ trống thích hợp. 1. The sign says "Stop". You …………… stop here. 2. The teacher said:"You …………… do all exercises on page 21 in Look Ahead." 3. I …………… help little brother more. My father said so. 4.I……………take these medicines. The doctor said so. 5. I …………… write lines as a punishment because I threw   the shoe of my neighbour through the window. 6. Sorry, I can't come. I …………… clean my room. I can't live in such a mess anymore. 7. He ……………       clean the classroom because he had been throwing papers on the ground. 8. "You ……………   help me", said the mysterious woman to the detective. 9. "The rules ……………     be obeyed at all times!" shouted the headmaster. 10. "I   …………… go. Otherwise I'll miss my train." 11. I ……………   be home at one o'clock. Otherwise, my mother will kill me.