cmr 111...1-222...2 là số chính phương                                                                                                                                                   200c/s 1;100c/s 2 

viết tập hợp sau bằng cách liệt kê các phần tử: a,A=(x e n / 30:x)                                                                                                                                                     b,b=(x e n /x nhân (x-2)=0)

In this section you must choose the word or phrase which best completes each sentence. Circle the letter A, B, C or D against the number of each item 1-20 for the word or phrase you choose. 

1. My sister is very fond .................... chocolate candy.
     A. of                                 B. about                           C. with                        D. at

2. I have studied English ....................eight months.
    A. for                                 B. since                           C. by                           D. in

3. Listen ....................our teacher !
    A. with                               B. to                                C. for                           D. in

4. There isn’t ....................food in the house.
    A. none                             B. no                                C. some                      D. any

5. He arrives …………………..at six o’clock.
     A. at home                       B. home                           C. in home                  D. to home

6. Herbert has had his car………………….. 1999.
    A. ago                               B. since                            C. to                           D. for

7. How long will it ....................to get there ?
    A. cost                              B. lose                              C. make                     D. take

8. I ....................it to you if you don’t have one. 
    A. give                              B. gave                             C. will give                  D. would give

9. ....................your homework yet ?
    A. Did you finished          B. Are you finishing           C. Do you finish          D. Have you finished

10. It’s the best book I …………………..read.
    A. have ever                    B. had ever                       C. will ever                  D. can ever

11. He looked very..................when I told him the news.
    A. happily                        B. happy                            C. happiness              D. was happy

12. She is ..................in history.
    A. interests                      B. interested                      C. interesting              D. being interest

13. Is the Eiffel Tower taller....................Big Ben ?
    A. then                            B. than                               C. as                            D. of

14. At school, David was..................anyone else in his class.
    A. as clever as                B. as clever than                C. cleverer as             D. cleverest

15. She speaks French ....................than you.
    A. more faster                 B. more fluently                  C. well                         D. the most fluently

16. It began to rain while we…………………..soundly.
    A. slept                          B. were sleeping                 C. have slept                D. are sleeping

17. She doesn’t like coffee, does she ?
    A. Yes, she doesn’t        B. No, she does                  C. Yes, she did           D. No, she doesn’t

18. I won't go to bed …………………..I finish my homework.
    A. until                           B. when                             C. while                         D. since

19. Is this book ………………….. ? Yes, it's mine.
    A. you're                        B. yours                             C. you                           D. your

20. …………………..do you come to school ? By bus
    A. How                          B. What                              C. By                            D. When