11. A competitor may submit any number of entries , each one is accompanied by a packet top.

A. supposing B. notwithstanding C. assuredly D. provided

12. They always kept on good with their next-door neighbours for the children’s sake.

A. friendship B. relations C. will D. terms

13. He earns his living by old paintings.

A. reviving B. restoring C. reforming D. replenishing

14. Hotel rooms must be by noon, but luggage may be left with the porter.

A. vacated B. evacuated C. abandoned D. left

15. The majority of nurses are women, but in the higher ranks of the medical profession women are in a .

A. rarity B. minority C. scarcity D. minimum

1. Villagers are more kind, friendly and warm-hearted than city .

A. dwellers B. foreigners C. beginners D. movers

2. You can see the of the suburbs in Ho Chi Minh City with many apartment buildings, supermarkets, shopping centres, and schools.

A. urban area B. convenience C. urban sprawl D. living condition

3. Dong Khoi Street is the main shopping street in the of downtown in Ho Chi Minh City.

A. mind B.heart C.head D. spot

4. It is considered that life in a city is wonderful and .

A. funny B.boring C.enjoyable D. helpful

5. No city in America has monuments and museums into one area as Washington, DC.

A. as much B. such many C. as many D. a few

6. My passport last month, so I will have to get a new one.

A. elapsed B. expired C.ended D. terminated

7. The department is also deeply in various improvement schemes.

A. connected B. entailed C. involved D. implied

8. His answer was so confused that I could hardly make any of it at all.

A. interpretation B. meaning C. intelligibility D. sense

9. The main attraction of the job was that it offered the to do the research.

A. possibility B. proposal C. opportunity D. prospect

10. I wish you’d tell me what I do in this difficult situation.

A. shall B.would C.should D. ought

Bài 1

1) 3Mg + 4H₂SO₄ ====> 3MgSO₄ + S + 4H₂O

2) 8 AL + 30 HNO₃  ====> 8 Al(NO₃)₃ + 3NH₄NO₃ + 9 H₂O

3) 3 Fe(OH)₂ + 10 HNO₃ ====> 3 Fe(NO₃)₃ + NO + 8H₂O

4)  2 Fe_xO_y + ( 6x - 2y ) H₂SO₄ ===> xFe₂(SO₄)₃ + ( 3x - 2y ) SO₂ + ( 6x - 2y )H₂O

   Bài 2

a) Ta có : n H₂ = 0,2 ( mol )

Gọi n Fe = a ( mol ) ; n Al = b ( mol )

PTHH

  Fe + 2HCL ===> FeCL₂ + H₂

  2AL + 6HCL ====> 2AlCL₃ + 3H₂

 Theo pthh : a + 1,5 b = 0,2 ( mol )

Mà m hh fe và al bằng 5,5

  => 56a + 27b = 5,5

Nên a = 0,05  ; b = 0,1 

=> %m Fe = 50,9 %

     %m Al = 49,1%

b) Có : n HCL = 0,05 . 2 + 0,1 . 3 = 0,4 ( mol )

 => Cm ( HCL ) = 0,8 ( M )

Chứng minh: (ac + bd)² + (ad – bc)² = (a² + b²)(c² + d²)