`23` `B`

- Dẫn chứng : Today , millions of peope want to learn or improve their English but it is difficult to find the best method

`24` `C`

- Dẫn chứng : Another advantage is that you have to speak the language if you are with other people . 

`25` `D`

- Dẫn chứng : You don't have to make big changes to your life . As well as this , it is also a lot cheaper than going to Britain but it is never possible to achieve the results of living in the UK 

`26` `A`

- viable = possible (adj) : khả thi 

- Đáp án B `->` understandable (adj) : có thể hiểu được

- Đáp án C `->` important (adj) : quan trọng 

- Đáp án D `->` careful (adj) : cẩn thận 

`27` `B`

- Dẫn chứng : The most important things to do in this situation is to maximise your opportunities , to speak only English in class and to try to use English whenever possible outside the class