Mai hates eating fast food because it’s not good ……her health.

a.      on           b. for           c. at             d. in

2.     If you want to live long, you …… eat  much red meat.

a.      should              b. needn’t    c. have to    d. shouldn’t

3.      Don’t read in bed, ................ you’ll harm your eyes.

a.      or            b. and                   c. but           d. so

 4. When you are in the swimming pool, play _______and listen to the pool   lifeguard_______

       A. safe / careful                  B. safely / careful     

       C. Safe/ carefully               D. safely / carefully

     5.  These are their books and those are_______

        A. we               B. our                             C. ours                  D. us

      6. How _______ is it from Hanoi to Hue City ?

           A. many                   B. long                  C. far                     D. much

      7. Could you show me the way ______ the railway station please ?

     A. to               B. at                C. next                             D. from

      8. The boy is better _________English than I am.

A. for                    B. with                           C. in            D. at

      9. He looks different _________his father.

A. at                     B. with                           C. on           D. from

     10. _________novels are very interesting.

A. These               B. This                           C. That        D. It

II/ Choose the best answer.

Mai hates eating fast food because it’s not good ……her health.

         a.  on           b. for           c. at             d. in

If you want to live long, you …… eat  much red meat.

         a. should              b. needn’t      c. have to      d. shouldn’t

Don’t read in bed, ................ you’ll harm your eyes.

         a.   or             b. and                   c. but           d. so

4. When you are in the swimming pool, play _______and listen to the pool   lifeguard_______

         A. safe / careful                  B. safely / careful     

       C. Safe/ carefully               D. safely / carefully

 5.  These are their books and those are_______

        A. we               B. our                             C. ours                  D. us

 6. How _______ is it from Hanoi to Hue City ?

          A. many                   B. long                  C. far                     D. much

7. Could you show me the way ______ the railway station please ?

         A. to               B. at                C. next                             D. from

8. The boy is better _________English than I am.

       A. for                    B. with                           C. in            D. at

9. He looks different _________his father.

      A. at                     B. with                           C. on           D. from

10. _________novels are very interesting.

    A. These               B. This                           C. That        D. It

mạng có ấy

có tớ đã tra

b)\(\sqrt{x^2+2x}\) + \(\sqrt{2x-1}\)= \(\sqrt{3x^2+6x-2x+1}\)( ĐKXĐ \(x\ge\frac{1}{2}\))

Đặt a=​​\(\sqrt{x^2+2x}\), b=\(\sqrt{2x-1}\)(\(a>0,b\ge0\)) . Khi đó phương trình trở thành :​

\(a+b\)=\(\sqrt{3a^2-b^2}\)

\(\Leftrightarrow a^2+2ab+b^2=3a^2-b^2\)

\(\Leftrightarrow a^2-ab-b^2=0\)

Chia cả hai vế cho \(a^2\)-> phân tích thành nhân tử -> tìm \(\frac{a}{b}\)-> x -> thử ĐKXĐ

TÌm \(\frac{b}{a}\)nhé không phải \(\frac{a}{b}\)mk đánh máy lộn

1 is having 

-> thì HTTD 

-> có chữ at the moment nhận bt 

2 is barking 

-> thì HTTD 

-> wonder + v-ing 

3 gets

-> thì HTĐ 

-> every morning là dấu hịu nhận bt 

4 has gone 

-> thì HTHT 

5 drives 

-> thì HTĐ 

6 didn't work 

-> thì QKĐ 

7 are you going to learn 

-> thì TLG 

8 have lived 

-> thì HTHT 

9 are you wearing 

-> now là dấu hịu nhận bt của thì HTTD 

10 is cooking

VIII. Put the verbs in the present simple tense or present continuous tense.

1. Emily lives and works in Paris but she (have) …………is having………. a holiday in England at the moment.

2. I wonder why the neighbor’s dog (bark) ………is barking…………. again. Maybe there is a burglar!

3. Ann (get) ………gets…………. up at seven o’clock every morning.

4. Then she (go) …………goes………. to have a shower before breakfast.

5. Then she (drive) ……………drives……. to the beach and stays all day.

6. She (not/ work) …………isn't working………. because she won the lottery last year.

7. Why (you/ learn) ………are you learning…………. English this year?

8. I (live) ……………am living……. with my sister for two months because she is pregnant and I can help her.

9. What (you/wear) ……are you wearing……………. now? In that way, I will recognize you at the airport.

10. Kate is in the kitchen and very stressed! She (cook) …is cooking………………. dinner for 30 people.

IX. Put the verbs in the present simple tense or present continuous tense.

1. Where’s Tim? He (listen) is listening to a new CD in his room.

2. Don’t forget to take your umbrella with you to London. You know it always (rain) rains there.

3. Emily (work) works hard all day but she (not work) isn't working at the moment.

4. Look! That boy (run) is running after the bus. He (want) wants to catch it.

5. He (speak) speaks French so well because he (come) comes  from France.

6. Look! The boss (come) is coming We (meet) is meeting him in an hour and nothing is ready!

7. Do you usually (go) go away for Christmas or do you (stay) stay at home?

8. She (hold) is holding some roses. They (smell) smell lovely.

9. Look! It (snow) is snowing again. It always (snow) snows in this country.

10. Sally (swim) swims very well, but she (not run) doesn't run very fast.