3. Children are advised to go to bed early.  Children should.................................................. 4. You had better not to stay up late.  You shouldn’t .................................................................. 5. Lien couldn’t open the door of the classroom. => the door of the classroom…………………………… 6. . It was so late that nothing could be done  It was too ........................................................... 7.Lan is too short to repair the fan -> Lan is not……………………………………….. 8. No one is more beautiful than Van in my class. -> Van is…………………………………………… 9.Lan hasn’t visited her grandmother for two months. The last .................................................. 10. Ba began to learn English when he was in class 4 -> Ba has……………………………………………….. 11. My mother last visted her home village 2 years ago. ->The last ……………………………………… 12. It was so cold but he went out without an overcoat. => Although ..................................................... 13. I often looked after my younger sister when I was small. -> I used to......................................................