1 have been working

2 arrived 

3 was told 

4 was

5 was

6 asked 

7 said

8 hadn't been

9 had 

10 keeping

11 walked

12 will have participated

13 haven't met

14 wondered 

15 had heard

16 asked 

17 had done

18 said

19 had dropped

20 looked

1 D (phát âm là id còn lại là d)

2 C (phát âm là k còn lại là ch)

3 B (câm còn lại đọc là b)

4 A (đọc là g còn lại là z)

Tiện thể giải thích cho hết luôn đây

II,

1D (/t/ còn lại theo nhóm các âm ko theo qt)

2C (/c/ còn lại là /ch/)

3B (âm câm, còn lại là /b/)

4A (/g/ còn lại là /z/)

III,

1D: cấu trúc spend+V-ing

2A: cụm từ native speakers

3C: thì quá khứ hoàn thành tiếp diễn

4D: lời khen và lời cảm ơn

D C B A D A C D

chụp sáng và rõ hơn nhé

có hiêủ đuơcj đâu mà trả lơì

Oki

1B

2A

3B

4B

5D

6A

7B

8B

9D

10B

1 are

2 taught

3 will be - makes

4 is sleeping

5 building (dream of Ving: mơ ước được làm gì)

ChooseA, B, C, D for each gap in the following sentences 3. Osaka has become one of the...........​“liveable" city in Asia. A. more B. better​C. much D. most 4.The traditional craft has​​from generation to generation.​A. passed down B. passed​C. been passed down D. been passed by 5.The Van Phuc producers silk have expanded their silk garment goods​​ they can satisfy the varied demand for their silk. A. in order to B. despite​C. because D. so that 6. ___________ they moved to the city five years ago, they still remember living in a small town. A. Although B. Whereas​C. While D. In order that 7.This company has gone bankrupt. Do you know who will_________ ? A. take care of it B. look after it​C. take it over D. turn it up 8.The people in my village cannot earn enough money for their daily life. They can't______ this traditional craft. They have to find other jobs. A. help out​B. live on​C. work on​D. set up 9 .Peter and Jane said to me: “Our wedding will be held next week”. A.Peter and Jane said to me that my wedding would be held next week. B.Peter and Jane said to me that their wedding would be held the next week. C.Peter and Jane said to me that their wedding would be held the following week D. Peter and Jane said me that their wedding would be held the following week

Lời giải:

a. Khi $m=-4$ thì hpt trở thành:

\(\left\{\begin{matrix} 2x+y=-14\\ x-y=5\end{matrix}\right.\Leftrightarrow \left\{\begin{matrix} x=-3\\ y=-8\end{matrix}\right.\)

b. 

PT $(2)\Leftrightarrow x=y+5$

Thay vô PT(1):

$2(y+5)+y=3m-2$

$\Leftrightarrow 3y+10=3m-2$

$\Leftrightarrow 3y=3m-12$

$\Leftrightarrow y=m-4$

$x=y+5=m+1$

Vậy hpt có nghiệm $(x,y)=(m+1, m-4)$

Để $x+y=13$

$\Leftrightarrow m+1+m-4=13$

$\Leftrightarrow 2m-3=13$

$\Leftrightarrow m=8$

Bài 1:

Gọi A là kim loại hóa trị II cần tìm

\(n_{H_2}=\dfrac{0,28}{22,4}=0,0125\left(mol\right)\\ A+2HCl\rightarrow ACl_2+H_2\\ n_A=n_{H_2}=0,0125\left(mol\right)\\ M_A=\dfrac{0,3}{0,0125}=24\left(\dfrac{g}{mol}\right)\)

Vậy: Kim loại A(II) cần tìm là Magie (Mg=24)

Bài 2:

- Chỉ có Zn tác dụng với dd HCl dư chứ Cu thì không.

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=0,2\left(mol\right)\\ \rightarrow m_{Zn}=0,2.65=13\left(g\right)\\ \rightarrow m_{Cu}=15-13=2\left(g\right)\\ Vậy:m=2\left(g\right)\)