$Đáp$ $án:$
1. Who does these shoes belong to?
2. We used to have lots of friends when we lived in the country.
3. You should take care of the pet dog carefully.
4. My sister was born on July 1st.
5. Miss Lien gets to work by his motorbike every day.
6. We used to lived in Boston when I was a child.
7. He isn't strong enough to carry this box.
8. When did you last see Jane?
9. Because it rains heavily, we were late for school.
10. The ladder isn't tall enough to reach the window.
11. Do I have to clean this table?
12. It's dangerous to ride a bicycle so fast.
13. It will be impossible for them to come on Sunday.
14. We didn't arrive early enough to see the first film.
15. When are John and Mary getting married?
16. He didn’t forget and neither did she.
17. I’d rather you didn’t smoke in here.
18. Whose book is this?
19. My sister is the most intelligent in my family.
20. It took them 2 hours to drive to the countryside.