Read the following passage and mark the letter A, B, or C on your answer sheet to indicate the correct word or phrase that best fits each numbered blank.             
    Dear Sergio,

How (l) __________ you? (2) __________ you want to know about a typical day at my school? I always (3) __________ to school with my brother and my friend Steve. School starts at 7 o'clock. (4) __________ the morning, we have five lessons, usually different subject. Then we have lunch. I (5) __________ have lunch at school, often I go home. In the afternoon, there (6) __________ two lessons. My favorite subject is Geography. After school, we often play football. What about you? 

 Bye for now,

 George

first. A. do B. go C. are 

2. A. Does B. Do C. Are

3. A. walk B. walks C. walking

4. A. On B. In C. At

5. A. don't B. not C. doesn't

6. A. have B. is C. are

III. Put the verbs in brackets in the Present Continuous.

1. Alexander _____________ (study) for his exam at the moment. 

2. She _____________ (not play) golf tomorrow. 

3. They _____________ (make) dinner now. 

4. David _____________ (not fly) to Chicago next week. 

5. I _____________ (work) on a special text tonight. 

6. We _____________ (not cook) dinner this evening because we're eating out. 

7. _____________ (Tom/ drive) ___________to work right now? 

8. They _____________ (not prepare) for the science exam at present. 

9. _____________ (they /have)________ a party this weekend? 

10. Mr Tung, our English teacher (never/ be )____________________ late for lessons.

11. He (often/ clean)____________________ his bedroom at the weekend.

12. My sister (never/ help)___________________ me with my homework.

13. I (sometimes/ be)____________________ bored in the Maths lessons.

14. We (rarely/ watch)______ football on TV.

15. Tony (never/ play)____________________ computer games with me.

16. What time __________the music performance (start) ______ ?

17. The restaurant (open) ____________________at 7 AM in the morning.

18. The Ha Noi – Lao Cai train (leave) ____________________ at 4:45 PM

19. What time_______ the restaurant (close) ____________________ ?

20. The film (end) ____________________ in ten minutes.

a ) viết công thức tính số lượng tế bào được tạo ra sau "n" lần phân chia ?

bội của 336 

.3 ( 2x + 1 ) - 19 = 14