reporter: phóng viên :v

A

mechanic: thợ máy

reporter: nhà páo

architect: kiến trúc sư

dentist: nha sĩ

1.

`y'=(m-1)x^2+2mx+3m-2`

TH1: `m-1 =0 <=> m=1`

`y'=2x+1` (L)

`=> m=1` không thỏa mãn.

TH2:`m \ne 1`.

Hàm số nghịch biến trên `RR <=>` $\begin{cases}m-1<0\\ \Delta'=m^2-(m-1)(3m-2)≤0\\\end{cases}$

`<=>` $\begin{cases}m<1\\m≥2 \vee m≤\dfrac{1}{2}\\\end{cases}$ `<=>m≤1/2`

Vậy  `m≤1/2`.

1. Don't talk - is sleeping
2. is washing - has just repaired 
3. hasn't come
5. rains
6. repairing

41. having
42. enjoy
43. played
44. went
45. rode
46. firmly
47. going
48. shopping
49. most
50. want

1. A
2. D
3. A
4. A
5. A
6. B
7. C
8. C
9. D
10. B

2. Do they water the flower ? - yes,l they do. 
3. Do you and your father play chess ? - No, we don't.
4. Does she write an email ? - Yes, she does.
5. Do Mark and Tania go to the cinema ? - No, they don't.
6. Was it rain last night ? - Yes, it was.
7. Did your mother cook dinner yesterday ? - No, she didn't.
8. Do they have fish and beef for lunch ? - Yes, they do.
9. Do you and Lucy swim in the pool ? - No, we don't.

15. sang
16. came
17. drove
18. sat
19. visited
20. washed
21. colored
22. rained
23. cleaned
24. took
25. ate
26. looked
27. put
28. opened
29. ride
30. got

29. Nuclear energy can provide enough electricity for the world's needs for hundreds of years.
30. Solar energy is not only clean and safe but also plentiful and infinite.
31. The teacher asked me where my father worked then.
32. Despite her good performance, she lost the match.
33. My friend Tom not only can compose songs but also sings Western folk songs very well.
34. It's the first time I have read such an interesting book.