B (nếu mình không nhầm)

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Chúc bạn học tốt <3 

6. D

7. B

8. C

9. B

10. C

11. D

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Chúc bạn học tốt <3

Bài 1: 

- Thời gian con gấu đuổi kịp nhà sinh vật học là: 23 : 6 \(\approx\) 3,83 (s)

=> thời gian nhà sinh vật học chạy về xe \(\le\) 3,83 (s)

=> quãng đường nhà sinh vật học chạy về xe \(\le\) 3,83 . 4 = 15,32 (m)

=> d max \(\approx\) 15,32 (m)

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Chúc bạn học tốt <3

1. My sister managed to finish her work though she was ill.

2. The test was very difficult; however, the students did it well.

3. Because she was careless, she broke the vase I liked best

4. People use energy- saving bulbs in order to save electricity

5. We got on a wrong bus so we were late for class.

6. I get access to the Internet so that I can communicate with my friends

7. I enjoy watching dangerous sports and game shows

8. We should do more grammar exercises so as to improve our English.

9. Because the man didn't relize that the traffic lights were red, so he didn't stop

10. People are getting weaker and weaker since the air is more and more polluted. 

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Bạn tự cân bằng phương trình nhé!

 Na2O + H2O --> NaOH

Fe2(SO4)3 + NaOH --> Fe(OH)3 + Na2SO4

CuO + H2SO4 --> CuSO4 + H2O

CuSO4 + NaOH --> Cu(OH)2

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Chúc bạn học tốt <3

1. did

2. taught

3. sent

4. spent

5. began

6. cut

7. put

8. gave

9. wrote

10. was/ were

11.bought

12. had

13. took

14. went

15. made

16. thought

17. saw

18. ate

19. sang

20. wore

Chúc bạn học tốt <3

- Sơ đồ bài toán: 

Cây cam:     |---|

Cây bưởi:    |---| |---|

Cây chanh:  |---| |---| |---|

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Tổng cộng: 426 cây

=> Số cây cam là: \(\dfrac{426}{6}\)= 71 (cây)

Số cây bưởi là: 71 x 2 = 142 (cây)

Số cây chanh là: 71 x 3 = 213 (cây)

Chúc bạn học tốt <3

He has left this city for 3 years.

Chúc bạn học tốt <3