thực hiện phép tính :

b ( x + 2 ) ( x^2 - 2x + 4 )

c ( 4x^ - 8x^2 + 13x - 5 ) : ( 2x -1 )

Countable or uncountable nouns :

 Candy / egg / meat / rice / milk / bread / sugar/ bowl / banana / cup / ham / mango / cupboard / tea / fish / butter / coffee / chicken .

Read the following passage and decide whether each of the statements 1 - 5 is TRUE or FALSE :

   Recent studies show that more and more teenagers are turning to screen - based activities for relaxation . Almost very teenager watches TV . Many of them surf the web . They join social networking and play video games . Unlike outdoor activities , more screen time harms children . It makes their eyesight weaker . It does not improve their social skills . A child often prefers TV or computer games to physical exercise . They don't want to meet friends , either . Experts people of these harms , but parents do little to help their children . 

 1. There has been an increase in the number of teenagers enjoying media use ......

 2. More teenagers browse the web in their free time ....

 3. Continuous media use betters teenagers' social skills ....

 4. Experts have encouraged media use as relaxation among teenagers ....

 5. Experts , the government , and parents cooperate to minimize the risks of screening time among children ....