Tham khảo:

Mùa hè đến rồi! Là em biết mùa của Hoa Phượng đã tới. Xung quanh trường em là những cây phượng với từng chùm hoa đỏ rực một góc trời vào mùa hè. Cây phượng ở trường em rất to. Thân cây phượng thẳng tắp nhưng vỏ cây rất sần sùi và có màu nâu. Rễ cây như một con rắn khổng lồ và ngoằn ngoèo uốn lượn. Cây phượng có rất nhiều cành, cành to, cành nhỏ thi nhau vươn cao hơn. Hoa phượng có năm cánh với nhụy vàng chính giữa, hoa phượng đỏ rực mọc thành từng chùm. Những cành phượng là nơi những chú chim đậu và cất tiếng hót véo von. Giờ ra chơi, chúng em còn được ngồi hóng mát dưới những cây Phượng. Em yêu hoa phượng – loài hoa học trò thân thương.

Tham khảo:

2KMnO4->K2MnO4+MnO2+O2

nKMnO4=5,53/158=0,035 mol

=>nO2=0,035/2=0,0175 mol

nO2 cần dùng=0,0175x80%=0,014 mol

4R+nO2->2R2On

=>nR=0,014x4/n=0,056/n mol

=>MR=0,672:0,056/n=12n

n=2=>MR=24 => R là Magie

VI. combine each pari of sentences , using present participle (V-ing) or past participle(V-ed)

2. The boy was taken to the hospital. He was injured in the accident.

--> The boy injured in the accident was taken to the hospital.

3. The road is very narrow. It joins the two villages.

--> The road joining the two villages is very narrow.

4. Do you know the woman? The woman is talking to Tom.

=>Do you know the woman talking to Tom?

5.The window has been repaired. It was broken last year.

=> The window which was broken last year has been repaired.

6.

D

Ti lệ bản đồ 1 : 15.000.000 có nghĩa là 1 cm trên bản đồ ứng với 15.000.000 cm hay 150 km trên thực địa.

IV. Combine These Pairs Of Sentences Using Relative Pronouns:

1. The first boy has just moved. He knows the truth.

The first boy who knows the truth has just moved.

2. I don't remember the man. You said you met him at the canteen last week.

I don't remember the man whom you said you met last week.

3. The only thing is how to go home. It make me worried.

The only thing which makes me worried is how to go home. 

4. The most beautiful girl lives city. I like her long hair very much.

The most beautiful girl whose long hair I like very much lives in the city.

5. He was Tom. I met him at the bar yesterday.

He was Tom whom I met at the bar yesterday.

6. The children often go swimming on Sundays. They have much free time then. The children, who have much free time then, often go swimming on Sundays

7. They are looking for the man and his dog. They have lost the way in the forest.

They are looking for the man and his dog that have lost the way in the forest.

8. The tree has lovely flowers. The tree stands near the gate of my house.

The tress which stands near the gate of my house has lovely flowers. 

9. My wife wants you to come to dinner. You were speaking to my wife

My wife, whom you were speaking to, wants you to come to dinner.

10. The last man has just returned from the farm. I want to talk to him at once.

I want to talk to the last man who has just returned from the farm.

11. The students will be awarded the present. The students' reports are very valuable.

The students whose reports are very valuable will be awarded the present.

Choose the best answer from A, B, C or D.

1. Time is short, and the secretaries are typing………..

A. with a pressure   B. under pressure   C. under the pressure   D. to pressure

2. I came............... a reference to Makonde carving when I was an artist.

A. across      B. into              C. over               D. for

3. He’s a .................. drinker and can nearly always be found in the hotel bar.

A. full                        B. strong                  C. high                         D. heavy

4. I don’t like the wine. It.............. so sweet.

A. tastes                  B. looks                 C. sounds                                D. feels

5. The younger…….......is more interested in fashion than we were

A.  people            B. group                 C. population                  D. generation

6. She................. for a neighbor to look after the house while she was away.

A. arranged                B. organized            C. planned                D. gained

7. His…………….. of the aero plane was correct in every detail and could really fly.

A. shape                      B. model                     C. design                  D. pattern

8. We believe that these animals could be saved if our plan were...................

A. taken up                  B. adopted                 C. practiced                  D. carried

C