1. Form opposites by adding correct prefixes.

(Tạo các từ trái nghĩa bằng cách thêm vào tiếp đầu ngữ đúng.)

dis- il- im- in- ir- un-

1. illegal

2. regular

3. possible

4. able

5. agree

6. believe

7. responsible

8. literate

9. accurate

10. conscious

11. mature

2. Complete the definitions with words formed by adding prefixes to the words in capitals.

(Hoàn thành các định nghĩa với từ được tạo thành bằng cách thêm vào tiếp đầu ngữ cho từ được in hoa.)

1. after the WAR                                 post-war

2. the opposite of ALLOW

3. having many COLOURS

4. BEHAVE badly

5. PAID too little

6. in favour of DEMOCRACY

7. WORK too much

8. against NUCLEAR

9. before the ELECTION

10. extremely SENSFIVE

11. not PERFECT

3. Complete the words in bold with the correct prefixes.

(Hoàn thành các từ in đậm với các tiếp đầu ngữ đúng.)

1. The effects of the drought seem to have been underestimated - the current situation is much worse than we initially thought.

2. If you insist on behaving so ___responsibly, David, it is impossible for me to treat you like an adult.

3. My grandma remained ___married for 65 years before she finally met John and they decided to become husband and wife.

4. If you ___cook meat, there is a risk that dangerous bacteria are left in the areas that don't get hot.

5 Warning: Your anti-virus programme has been ___abled and your computer could be at risk.

6. The government has been criticised by environmental organisations for being ___willing to spend more on protecting marine wildlife.

7. Are you sure this is a reliable website? In my opinion, the author is just spreading ___information to attract more readers.

4. Complete the sentences with the correct form of the root words in brackets.

(Hoàn thành các câu sau với dạng đúng của các từ gốc ở trong ngoặc.)

1. Refugees who have entered the country illegally (legal) are currently treated as criminals.

2. With the correct training techniques, even the most _____ (obey) dogs can be taught to behave.

3. Our English teacher says my essay will have to be _____ (write) because he can't read my handwriting.

4. I _____ (understand) the care instructions for my shirt and shrank it in the washing machine.

5. I managed to delete most of the unnecessary apps that came _____ (install) on my phone.

6. If there is even the smallest _____ (perfect) in one of our products, this software will detect it.

7. Speaking no fewer than five languages, Pierre is truly _____ (lingual).

8. If you suffer from skin problems, try our new _____ (acne) face wash for instant results.

9. Our neighbour's cat is so skinny that I think they must be _____ (feed) it.

10. This paragraph of your essay is completely _____ (relevant), so I think you should delete it.