1. We have worked for the party for four hours .

2. It's quite easy to learn English

3. English is spoken all over the world

4. The yard isn't big enough to play soccer in

5. She is looking forward to seeing her parents soon

6. Mai asked Ba to help her hang the picture

7. Lan said that she would come to see he as soon as she could

8. The weather is good to go swimming

9. Would you mind helping me to put the chair away ?

10. Who was this book written ?

The computers is helpful. It's can help us do many thing. It's help us learning English, listening to music, watching movie, ....The computer is useful but spend too much time to working with computer can be addticve. So we shouldn't spend too much time to working on the computer.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

          Dinosaurs were reptiles that lived during a period of earth’s history called the Mesozoic Era, which is known as the Age of Reptiles. The first dinosaurs appeared more than 200 million years ago. For many millions of years, they dominated the land with their huge size and strength. Then about 65 million years ago, they died out rather suddenly, never to reemerge.
          The word dinosaur comes from two Greek words meaning “terrible lizard”. Dinosaurs were not lizards, but their appearance could be truly terrifying. The biggest ones weighed more than ten times as much as a mature elephant and nearly equaled the size of most modern—day whales. The famous kinds of dinosaurs, including the brontosaur and tyrannosaurus, reached 80 to 90 feet in length. Not all dinosaurs were giants, however, some were actually no larger than a chicken.
          Scientists still do not know what caused dinosaur to disappear. One theory involves a change in the earth’s climate. It is believed that temperature dropped significantly towards the end of the Cretaceous Period. Too large to hibernate and not having fur or feathers for protection, it is possible that the climate became too chilly for dinosaurs. In contrast, other species having protection, such as the mammals and birds, were able to survive

The word “ones” in the passage refers to __________

A. dinosaurs        

B. millions  

C. lizards     

D. whales

gọi số xe chở hàng lúc đầu là x (xe) (x>0)

vậy mỗi xe chở được là : \(\dfrac{480}{x}\)(tấn )

Số xe sau khi thêm 3 xe là: x+3(xe)

thì mỗi xe chở được \(\dfrac{480}{x+3}\) (tấn )

Theo đb, ta có pt:

\(\dfrac{480}{x}\) -\(\dfrac{480}{x+3}\)=8

=> 480 ( x + 3 ) - 480x = 8x ( x + 3 )

<=> 480x + 1440 - 480x = 8x\(^2\) + 24x

<=> -8x\(^2\) - 24x +1440 = 0

mình chỉ làm đươc đến đây thôi

Mark the letter A,B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions

“You had better see a doctor if the sore throat does not clear up”, she said to me.

A. She ordered me to see a doctor if the sore throat did not clear up

B. She insisted that I see a doctor unless the sore throat did not clear up.

C. She suggested that I see a doctor if the sore throat did not clear up.

D. She reminded me of seeing a doctor if the sore throat did not clear up.