Thành phần phần trăm của Al trong công thức Al2O3 là bao nhiêu. Biết Al=27, O=16.

a.24,67%

b.27,64%

c.26,47%

d.27,57%

Khí nào nặng nhất trong tất cả các khí sau? (Biết N = 14, O = 16, C = 12, Cl = 35,5)

a.CO2

b.Cl2

c.N2

d.O2

Em có nhận xét gì về những trường hợp sau.
a) Giới thiệu với các bạn nước ngoài một số món ăn của Việt Nam
b) Nhuộm tóc và ăn mặc cho thật giống với người nước người

IX. Rewrite each of the following sentences in another way so that it means almost the same as the sentence printed before it. (1.0 pt.)

37. My teacher said to me “Don’t forget your homework.”

→ My teacher asked _____________________________________________________________

38. He has a lot of money. He can buy that car.

→ He has enough________________________________________________________________

39. No students in this class are as intelligent as him.

→ He is the ____________________________________________________________________

40. I started to learn English in 2017.

→ I have_______________________________________________________________________

VIII. Rearrange the groups of words in a correct order to make complete sentences.      (0.5 pt.)

35. a child / I was / When /, I / play football a lot / used to /. /

→ ____________________________________________________________________________

36. safe / to keep / It's / medicine/ in locked cupboards /. /

→ ____________________________________________________________________________

VII. Use the correct form of the word given in each sentence.           (1.5 pts.)

23. I’m very sorry because I behaved ____________________.  (bad)

24. Alexander Graham Bell  ____________________ demonstrated his inventions. (success)

25. Last year, we had an ____________________ summer vacation. (enjoy)

26. He often ___________________ some English words incorrectly. (pronunciation)

27. My parents are very ___________________ of me. (pride)

28. Thanks to modern ________________, we can save a lot of time on doing housework.(equip)

Nam promised himself to try his (23)__________ to learn English because it was (24) __________ for his work. He started (25) __________ twenty English words the first day, and then another twenty words the next day. Day by day, he would get a big amount of English vocabulary. He also practiced (26) __________ English frequently with his foreign neighbor, David. On the weekend, he (27) __________ part in English classes. After 6 months, his English improved a lot. Now, he can communicate (28)__________ English well.

23. A. good     B. well       C. better      D. best

24. A. useless       B. unsatisfactory      C. famous       D. necessary

25. A. learn      B. to learn    C. learned      D. learnt

26. A. to speak       B. spoke        C. speaking        D. spoken

27. A. took           B. participated             C. joined             D. got

28. A. on           B. at               C. of               D. in 

1.      He demonstrated his invention …………………...  . ( success )

A. succeed        B.success                C. successful               D. successfully

2.      You seem ……………………..today. ( happy )

A. happy        B. happiness          C. happily            D. unhappily

3.      What a ................… house you have! ( beauty)

A. beauty     B. beautiful                     C. beautifully              D. beautify

4.      My brother works for a youth …………………  .  ( organize )

A. organize     B.organized                            C. organizational     D. organization

5.      Who………………………… the telephone?  (invent)

A.invents         B.invented                             C. invention            D. inventor

6.      He showed his famous paintings to the public at very many …………………  . (exhibit ) 

A. exhibit         B. exhibitions                       C. exhibition       D. exhibitor

1.      He always studies hard  ..................... get good grades.

A. so at to  B.in order to  C.so that  D.in order that