b c a b a

1were

2 felt

3 had been

4would finish

5 would come

6 had 

7 had left

8 had come

a)mg+2hcl->MgCL2+H2↑

b) Cuo+2HCL→CuCL2+H20

c)Fe(OH)3+3HCL→FeCL3+3H2O

Fe2O3+6HCL→2FeCL3+3H2O

D)AL203+6HCL→2ALCL3+3H2O

1 a

2 b

3 a

4 b

5 a

1mary is as tall as hẻ brother

2 a lemon isnt as sweet as an orange

3 a donkey isnt as big as a horse

4 this dress is a pretty as this one

5 the weather isnt as cold as yesterday

49c

50b

51b

52c

53c

bài hát nối vòng tay lớn 

nhạc sĩ trịnh công sơn

nhịp 2/4

giọng mi thứ