I. Rewrite the sentences with the same meaning:
1. He plays badminton the best in my team.
=> No one in ……my team plays badminton better than him……..
2. This is the most difficult exercise in the book
=> No exercise in………the book is more difficult than this one………..
3. Do you have a more comfortable chair than this one?
=> Is this ………the most comfortable chair you have?………..
4. I have never seen a more boring film than this before.
=> This is the ………most boring film I've ever seen………..
5. She isn’t as beautiful as her mother.
=> He mother …………is more beautiful than her…………..
II.  Rearrange the words to make sentences.
6. ever/interesting/most/film/I/This/have/is/the/seen/that
=> ………This is the most interesting film that I have ever seen……………..
7. hotter and/ weather/The/getting/hotter/is
=> …………The weather is getting hotter and hotter…………..
8. father/ runner/faster/My/than/is/a/am/I.
=> …………My father is a faster runner than I am………..
III. Write NO MORE THAN THREE WORDS in each gap
9. Today is ………the longest…… day of the year (long) 
10. I have never tasted ……a more delicious………..cake than this one. (delicious)

Cho A=(-∞;6), B=(-∞;a). Chứng minh rằng A\B=Ø với mọi a

Cho 2 tập hợp A=(m-2;8) và B=(6;+∞). Tìm m để A\B=Ø