số  hòn bi của căn là:
  5+4=9 (hòn bi )
số  hòn bi của bình là:
9+3= 12( hòn bi )
  đáp số : 12 hòn bi

1.     Sarah was absent ………. her school due to her sickness.

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

2.     Tim promises he…………his best to improve his Spanish pronunciation.

a.      will try         b. to try            c. trying            d. tries

3.     How did Tim study this semester?

a.      The Spanish sounds are hard                                             c. He has Math five times a week.
b.     He worked really hard.                                                       d. His mother believes he can do it. 

4.     ……………… remember the words better, you should revise them regularly.

a.      So as : Vì vậy, như                                            b. So that: Vậy nên           c. In order that: Để điều đó                                       d. In order to: Để

5.     Language learners don’t have to learn all new words they come ………

a.      across      b. up          c. on          d. into

6.     Both Sarah’s participation and co-operation are …….

a.      satisfy                      b. satisfaction                                       c. satisfactory                   d. satisfactorily

7.     Some learners make a list and put into it the meaning of new words in their ….

a.      sentences                 b. mother tongue              c. foreign language           d. examples

8.     He had an accident because he was driving ………

a.      careful                      b. carefully                       c. careless  d. carelessly

9.     Sorry, I’m speaking …………. because I have a sore throat.

a.      fastly                        b. softly                             c. well       d. excellently

10.   The teacher told us to learn these lessons ……. heart.

a.     In                              b. with                               c. to                                   d. by

11.  I’m pleased to hear that you had an ……. Christmas vacation.

a.      Enjoy                       b. enjoyment                     c. enjoyable                      d. enjoyably

12.   “Could you pass me that pen?”, Mai said.

a.      Mai advised me to buy that pen.                       c. Mai told me not to give her that pen.

b.     Mai asked me to pass her that pen.                   d. Mai said she could pass me that pen.

13.  I think revision is ……………………in learning words.

a.      Satisfactory             b. different                        c. necessary                      d. proud

14.  Sarah should work harder …. her listening skill.

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

15.  Tim works hard and has good study…….

a.      semesters                 b. habits                            c. conservation                 d. practice

16.  How much time do you spend… English?

a.      on                             b. from                              c. about                             d. in

17.  “May I see the report?”

a.      Don’t worry.            b. Yes, I know.                 c. I’ll try my best              d. Sure. I’m proud of you.

18.  We …… our first semester reports a few days ago.

a.      Receive                    b. are going to receive      c. received                        d. will receive

19.  I’m very sorry. I know I behaved …….

a. fluently                      b. badly                             c. well                               d. hardly

      20. “Don’t make so much noise.” said my father.

            a. My father said not to make so much noise.

            b. My father told me not to make so much noise.

            c. My father asked me not to make so much noise.

            d. b & c are correct.

- Trong phản xạ rụt tay khi chạm vào vật nóng thì trung tâm xử lí thông tin nằm ở tủy sống
- Khi tay chạm vào vật nóng →cảm thấy nóng (nhờ cơ quan thụ cảm) →xung thần kinh theo noron hướng tâm noron trung gian ở trung ương thần kinh → noron li tâm → cơ ở tay → cơ co( cơ  quan phản ứng → rụt tay lại.

1.     My mom said to me: “Tidy your room!”

 → My mom ………………………………………………

2.     "Don't make a mess!", said Hellen’s teacher.

 → Hellen’s teacher ……………………………………………

3.     "I was wondering if you could possibly tell me the time?", Annie said.

 → Annie asked me………………………………………………

4.     My friend asked me: "Would you mind lending me a pencil?"

 →   My friend ………………………………………………

5.     "Please help me carry my bag." said my sister.

 → My sister …………………………………………….

6.     Karen: "Don't play football in the garden!"

 → Karen told me ……………………………………………….

7.     Can you read the instructions for me again?” she said.

 → She asked me …………………………………………….

8.     Post the letter for me, will you?” he said.

 →  He asked me ……………………………………………….

9.     Correct your grammatical mistakes in your work.”, her friend said.

 →  Her friend told ……………………………………

10.  John said to me: “Please wait for me outside your office.”

 → John asked ……………………………………….

11.  The doctor said to his patient: “Do exercise regularly.”

 →The doctor advised ………………………………………….

12.  “You should learn harder to improve your English pronunciation.”, said my teacher.

 → My sister said ………………………………………………

13.  “You should practice playing the guitar every day”, the teacher said.

 → The teacher told …………………………………….

14.  My teacher said: “You should read a number of books before exam.”

 →My teacher advised ……………………………………..

giúp mình với mấy bạn ơi

1) A

2) C

1) Bell demonstrated his inventions to the public at countless exhibitions.

2) In America, Bell worked with people who could neither speak nor hear.

3) I think we ought to put the rug between the armchair and the couch.

4) You must  put all chemicals and drugs in locked cupboard.

5) Children may drink or eat all chemicals and drugs  because they  look like soft drink or candy.

6)  You must cover electrical sockets so that children do not try to put anything into them