41 It is the tornado

42 They are in the village school

43 When the Tornado was coming, a sudden loud whistling could be heard

44 The population of the village is 185

45 They compared it worse than a war zone

VII

46 If she weren't ill, she could come to class

47 The children's mothers are often given flowers on the Women's day

48 Those students, who didn't do their homework, were punished

49 Although it was a bad day, we went out for a picnic

50 I wish our team had played well so we hadn't lost the game

là sao mùn ko hỉu

vô link đó giải hộ mk ak Vương Đức Hà

14 Lan asked Thu where she could find the new cartoons

15 Phong asked Lan if their teacher asked them to clean up the room

16 She asked me to give her some money

17 Tam asked Thu if she would be there for five days

18 The students asked their teacher to give them easier homework

19 She asked her husban if they needed some help

20 Lan asked Hoa is she might have a look at her picture

21 Lam asked Lan if their class would take part in that competition

42 rains

43 gives

44 returns

45 will go

46 study

47 would try

48 has just published

49 has traveled

50 wouldn't lose/didn't lose/hadn't lost

51 didn't rain

52 hot

53 Have you ever been - have been

54 could

55 wants - study

56 listening

57 rings

58 took part

59 was spoken

60 do - to learn

I

0 C

1 D

2 C

3 A

II

0 C

1 C

2 D

III

0 C

1 D

2 B

3 B

4 D

5 C

6 B

7 A

8 C 

I

1 C

2 D

3 D

4 A

5 B

II

6 C

7 A

8 A

9 A

10 D

11 C

12 C

13 C

14 D

15 D

16 D

17 C

18 B

19 C

20 B

III

21 painting => being painted

22 she => bỏ

23 doesn't => isn't

24 at => in

25 didn't => wouldn't

mấy men or girl bạn nào làm đk giải giúp mk đi mk thanks trước nhá

ta muốn làm nắm nhưng mi bợi thêm năm nữa đi nha đợi ta lên lớp 8 ta giải cho

giãn ra

Bạn ơi bạn chịu khó gõ tay đi chứ nhìn hình......

Tần số là số lần dao động của vật trong 1s. Đơn vị Hz

Tần số dao động của vật thứ nhất là: 700:10=70H

Tần số dao động của vật thứ hai là: 9000:300=30Hz

Vật 2 dao động âm chậm hơn và vật 1 phát ra âm cao hơn. Vì tần số dao động của vật 1 > vật 2