A

B

a/ \(B=(\dfrac{2}{\sqrt{x}-3}+\dfrac{\sqrt{x}-6}{x-9}):(1+\dfrac{6}{x-9})\)

   =  \((\dfrac{2}{\sqrt{x}-3}+\dfrac{\sqrt{x}+6}{(\sqrt{x}-3)(\sqrt{x}+3)}):(\dfrac{x-9}{x-9}+\dfrac{6}{x-9})\)

   =\((\dfrac{2(\sqrt{x}+3)}{(\sqrt{x}-3)(\sqrt{x}+3)}+\dfrac{\sqrt{x}-6}{(\sqrt{x}-3)(\sqrt{x}+3)}):(\dfrac{x-3}{x-9})\)

   =\((\dfrac{2\sqrt{x}+6+\sqrt{x}-6}{(\sqrt{x}-3)(\sqrt{x}+3)}):(\dfrac{x-3}{x-9})\)

   =\((\dfrac{2\sqrt{x}+6+\sqrt{x}-6}{x-9}).(\dfrac{x-9}{x-3})\)

    = \(\dfrac{3\sqrt{x}}{x-3}\)

Vậy B=\(\dfrac{3\sqrt{x}}{x-3}\)

b/ Để B≥0 thì \(\dfrac{3\sqrt{x}}{x-3} \)≥0

                   \(<=>\begin{cases} x-3 không= 0\\ 3\sqrt{x}>/0 \end{cases} \)

                     <=> \(\begin{cases} x không= 3\\ x>/0 \end{cases} \)

Vậy để B≥0 thì x không = 3 và x≥0

VIII.Reorder the words to make meaningful sentences.

25. Which/ you/ do/ sports/at /do/ school?                                             

Which sports do you do at school?

26. VTV3./ watching/ I/ a game/ on/ like/ of tennis  

I like watching a game of tennis on VTV3.

27. the street/ cross/ on/ the/ Don’t/ red light. 

Don't cross the street on the the red light.

28. you/ Did/ the/ men’s basketball final / on/ TV/ last night ? /watch/  

Did you watch the men's basketball final on TV last night?

IX.Finish each of the sentences in such a way that it stays the same as the sentence printed before it.

29. What sport do you like best?

→What is __your favorite sport__?

30. Shall we play badminton this weekend? 

→ How about __playing badminton this weekend ____?

31. Beckham played football very well.

→ Beckham was ____a good football player.________________________________

Đổi 20 phút=1/3h

Gọi x là độ dài quãng đường AB ( km,x>0)

Thời gian người đó đi từ A -> B là: \(\dfrac{x}{9}\)(h)

Thời gian người đó đi từ B về A với con đường khác là: \(\dfrac{x+6}{12}\)(h)

Vì thời gian trở về ít hơn thời gian đi 1/3h nên ta có phương trình:

\(\dfrac{x}{9}-\dfrac{x+6}{12}=\dfrac{1}{3}\)

<=>\(\dfrac{4x}{36}-\dfrac{3(x+6)}{36}=\dfrac{12}{36}\)

<=> 4x-3x-18=12

<=> x=30(nhận)

Vậy quãng đường AB dài 30km

19. might

20.help

V 29. responded

30. limitations

31.announcement

32. completely

33. humorous

34. advanced

VI. 35. If you want to pass an International Examination like IELTS, you have to make a plan right now.

36. Our school provides various places for beginners or intermediate students at all levels.

VII. 37. Lan asked me what I had done  to avoid corona virus.

38. Because she performed well, she received good comments.

39. Mary composes more creatively than her sister does.

40. I wish I would  see Susan off at the airport tonight.

II.Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the rest in the position of the main stress of the following questions.

3. A. national                          B. cultural                      C. popular            D. musician  

III.Circle the letter A, B, C, or D to indicate the correct answer to each of the following questions.

4. Our school football team____________ the match with Nguyen Du school last Saturday.

A. wins                           B. won                           C. win                            D. to win   

5. ____________ draw on the walls and tables, please!   

A. Do                                      B. Don't                         C. Should                       D. Shouldn't

6. I know I should take exercise, but I____________ do.   

A. ever                          B. often                          C. never                         D. always  

7. We were very upset when our favorite team____________ even one goal.

A. played                       B. didn’t take                 C. made                         D. didn’t score    

8. Badminton requires only a net, shuttlecock or____________.   

A. ball                            B. ski                             C. a racket                     D. goggles

9. When you go to the zoo, don't____________ the animals. 

A. look                           B. see                                       C. tease                          D. watch

10. "I'd like to watch motor racing because it is very____________."    

A. frightening                 B. exciting                      C. excited                       D. boring

11. Team sports are sometimes called____________ sports.   

A. compete                    B. competition               C. competitor                 D. competitive

12. Pele is widely____________ as the best football player all of time. 

A. regarded                    B. became                      C. liked                          D.thought

1. This is the first time she has eaten eel soup.

→ She has not…EATEN EEL SOUP BEFORE……………………………………………………

2. She began to write 30 minutes ago.

→ She has…BEEN WRITTING FOR 30 MINUTES .

3. They started studying English when they were in grade 3.

→ They have…STUDIED ENGLISH SINCE THEY  were in grade 3.

4. I last saw him 3 weeks ago.

→ I haven’t SEEN HIM FOR 3 WEEKS.

5. The last time I watched this movie was 6 months ago.

→ I haven’t WATCHED THIS MOVIE FOR 6 MONTHS.

6. It is a long time since she last saw her parents.

→ She hasn’t SEEN HER PARENTS FOR A LONG TIME.

7. When did you begin reading this book?

→ How long have YOU READ THIS BOOK?

8. This is the first time I have been abroad.

→ I haven’t BEEN ABROAD BEFORE.

9. I haven’t gone to the zoo since last year.

→ The last TIME I WENT TO THE ZOO WAS LAST YEAR.

10. I haven’t met my aunt since I was 10 years old.

→ I last MET MY AUNT WHEN I WAS 1 YEARS OLD.

11. This is the first time she has worked with foreigners.

→ She hasn’t WORKED WITH FOREIGNERS BEFORE.

12. She started to cry two hours ago.

→ She has BEEN CRYING FOR 2 HOURS.

13. We started to chat on the phone when it began to rain.

→ We have CHATTED ON THE PHONE SINCE IT BEGAN TO RAIN.

14. We got to know each other when we were at university.

→ We have KNOWN EACH OTHER SINCE WE WERE AT UNIVERSITY.

15. The last time she phoned her parents was 3 weeks ago.

→ She hasn’t PHHONED HER PARENTS FOR 3 WEEKS.

1.         This singer will _______BRING OUT__________ a new album this year.

2.         Peter is very reliable. You can ______COUNT ON___________ him.

3.         You should _____CUT DOWN____________ your essay ______ON___________ 500 words.

4.         Jim is depressed as he has been ________TURNED DOWN _________ by five companies so far.

5.         I can’t ________PUT UP WITH_________ such disturbing noise any more.

6.         My mother is always __CHECKING UP ON_______________ me.

7.         Mr. Smith has ___TAKEN UP______________ golf.

8.         Are you tired of _____DEALING WITH____________ complaints from your customers?                 

9.         How are you now? I heard that you __COME DOWN WITH_______________ flu last week.

10.       ____HOLD ON_____________! I think we’ve got lost.This isn’t the right road.