Cho tam giác ABC Nội tiếp (O) D là điểm bất kì trên (O) có hình chiếu xuống AB,BC,CA là M,N,P 
CMR:
a, B,M,N,D cùng thuộc một đường tròn .
b, D,B,C,N cùng thuộc một đường tròn .
c, M,N,P thẳng hàng

Being overshadowed by Ha Long Bay to the north, Cat Ba Island is often left out of the itineraries of the majority of travellers coming to Viet Nam. Nevertheless, Cat Ba Island is one of the most underrated destinations in Viet Nam. The massive island of Cat Ba is a fantastic destination for ecotourism and adventure activities in Northern Viet Nam. Cat Ba National Park, which was established on 31st March 1986, is one of the most ecologically diverse national parks in Viet Nam. The park possesses seven different ecosystems, both underwater and inland. It is home to thirty- two types of mammals, along with seventy bird species, and more than a thousand species of plants, hundreds of which can be used as medicines. There are several different hiking and trekking routes through rugged and forested mountain within Cat Ba National Park. These routes are also divided by different levels of difficulty, so travellers don’t have to be worried if their fitness is not very good. In addition, travellers can take a side visit to explore the exquisite Trung Trang cave, or discover the traditional village of Viet Hai.
23: Cat Ba Island is suitable for ………. .
A. ecotourism and adventure activities
B. many indoor activities
C. scientific research and exploration 
D. experiencing urban life
24: Which of the following is NOT TRUE about Cat Ba National Park according to the passage?
A. Cat Ba National Park was established in 1986.
B. There are seven different ecosystems in Cat Ba National Park.
C. Hiking and trekking Cat Ba National Park requires a high level of fitness.
D. It is one of the most diverse national parks in Viet Nam.
25: Many travelers choose not to visit Cat Ba Island because ………. .
A. It is too far from Ha Long.
B. there is too much rain there
C. it is not a good destination for tourism 
D. they think Ha Long Bay is much better
26: Which of the following can be used as medicines?31
A. birds
B. mammals, birds and plants
C. plants
D. mammals
27: The word “rugged” in the passage is closest meaning to ………. .
A. flat
B. even
C. uneven
D. smooth

After inventing dynamite, Swedish-born Alfred Nobel became a very rich man. However, he foresaw its universally destructive powers too late. Nobel preferred not to be remembered as the inventor of dynamite, so in 1895, just two weeks before his death, he created a fund to be used for awarding prizes to people who had made worldwide contributions to mankind. Originally there were five awards: literature, physics, chemistry, medicine and peace. Economics was added in 1968, just sixty-seven years after the first awarded ceremony.Nobel’s original legacy of nine million dollars was invested, and the interest on this sum is used for the awards which vary from 30.000 dollars to 125.000 dollars.Every year on December 10, the anniversary of Nobel’s death , the awards (gold medals, illuminated diploma and money) are present to the winners. Sometimes politics plays an important roles in the judges’ decision. American have won numerous science awards, but relatively few literature prizes.No awards were presented from 1940 to 1942 at the beginning of World War II. Some people have won two prizes, but this is rare; other have shares their prizes.
29: When did Nobel creat a fun to be used for awarding prizes?
A. 1895
B. 1901
C. 1962
D. 1968
30: In which field have American received the most awards?
A. Literature
B. Peace
C. Economics
D. Science
31: In how many field are the prizes given?
A. 2
B. 5
C. 6
D. 10
32: Which of the following statements is NOT true.
A. Awards vary in moneytory value
B. Ceremonies are held on December 10 to commemorate Nobel’s invention C. Politics can play an important role in selecting the winners
D. A few individuals have won two awards. 

tính diện tích hình thang cân nội tiếp đường tròn (O;R) biết rằng đáy lớn gấp đôi đáy mỗi cạnh còn lại

tính diện tích hình thang cân nội tiếp đường tròn (O;R) biết rằng đáy lớn gấp đôi đáy mỗi cạnh còn lại

tính bán kính đường tròn ngoại tiếp hình thang cân biết đường cao bằng 7cm và hai đáy bằng :
a,10 cm và 24 cm      
b, 6 cm và 8 cm

hai doesn't run as fast as he used to. Hai used _________________

"what about attending the lectures of security?" loan said to me
(suggested)

celebrate           reached                buildings              turned               house              gathered

Thousands of people (1) ___________ at the August Revolution Square in front of the Hanoi Opera House from 8:30 p.m to 9:30 p.m on March 29 to join the 2014 Earth Hour Campaign.

    The lights and unnecessary electrical appliances of the (2) ___________, shops and local families around the Hoan Kiem Lake and the Hanoi Opera House were (3) ___________ off during one hour of the campaign. A wide variety of unique arts performances were held at the Square to (4) ____________ this year’s Earth Hour.

    This is the sixth time Vietnam responds to the Earth Hour campaign launched by the World Wild Fund for Nature (WWF). ‘Let’s unite to save the Earth’ is the message that this year campaign conveys to people around the world.