Điền động từ khuyết thiếu " must" hoặc " have to " vào chỗ trống thích hợp.
1. The sign says " Stop". You ....must........stop here
2. The teacher said:"You...have to.......do all exercises on page 21 in Look Ahead."
3. I ......have to.......help my little brother more. My father said so.
4. I ......must.......take these medicines. The doctor said so.
5. I........must......write lines as a punishment because I threw the shoe of my neighbour through the window.