1 homeworks => homework

2 aren't => don't 

3 some apples => any apple

4 stands => is standing

5 to => for

6 have => has

7 gram => grams

8 a temple old => an old temple

9 stuaying => stay

10 any => some

III

1. A

2. C

3. B

4. A

5. B

6. A

7. C

8. B

9. A

anh ơi em ko bt vì em mới lớp 2 anh thông cảm cho em nha 

13. B

14. B

15. D

16. A

17. B

18. C

19. D

20. A

21. A

22. A

23. C

24. B

25. A

26. D

27. A

28. A

29. C

32. morning exercise
33. zebra crossing
34. winter
35. toothache

friends - listening - English - teacher
watching - stories - pen - club

F

T

We should go to the movie theater to relax.

If it is cold, my mother will come back home early.

Did you buy any milk yesterday?

She is not a teacher. 

Gọi CTHH của chất là S_aO_b

Ta có 32a + 16b = 2,76.29 \(\approx80\) (g/mol)

Ta có: \(\dfrac{m_S}{m_O}=\dfrac{32a}{16b}=\dfrac{2}{3}=>\dfrac{a}{b}=\dfrac{1}{3}\)

=> a = 1, b = 3

=> CTHH: SO₃

b) Theo quy tắc hóa trị, S có hóa trị VI

Tên gọi: Lưu huỳnh Trioxit

\(CT:S_xO_y\)

\(TC:\)

\(\dfrac{32x}{16y}=\dfrac{2}{3}\)

\(\Leftrightarrow\dfrac{x}{y}=\dfrac{1}{3}\)

\(\text{Công thức đơn giản nhất là : }\) \(SO_3\)

\(M_{hc}=2.76\cdot29=80\left(\dfrac{g}{mol}\right)\)

\(\Leftrightarrow80n=80\)

\(\Leftrightarrow n=1\)

\(CTPT:SO_3\)

\(b.\)

\(\text{Lưu huỳnh hóa trị VI}\)

\(\text{Tên gọi : Lưu huỳnh trioxit}\)