A

0,000042 m3

Ngày thứ 3 sửa đc: 

1 - 1/4 - 2/5 = 13/20 ( đoạn đường) 

Đ/s

1. is singing

2. go

3.likes/ like

4. are staying

5.reads

6. is running

7. are playing/ play 

8. is/ is in/ is watching

9. Do/ go

10.are

11.doesn't go 

12.go/go

13. am writing

14.have/go

15.have

16. does/ living

17. am eatting/ is playing

26. is doing

19. are

20. Does/ walk

21. is/ learn

22. are/ doing 

23. Does/ walk

24. don't play

25. Does/ work