1 B

2 A

3 C

4 B

5 C

6 D

7 B

8 C

9 C

30 A

9. is/ tells

10. are

11. has

12. isn't

--------

B3

1. is

2. teaches

3. learn

4. comes

5. has

6. goes

7. meets

8. drinks

------------

B4

1. plays

2. drink

3. starts

4. live

5. do

6. speak

7. watches

------------

B5

1. does -> do

2. Do -> Does

3. watch -> watches

4. goes -> go

5. carries -> carry

6. don't -> doesn't

7. plays -> play

8. are -> is

bài nào vs ak

9. is/ tells.

10. are.

11. has.

12. isn't.

B3

1. is.

2. teaches.

3. learn.

4. comes.

5. has.

6. goes.

7. meets.

8. drinks.

B4

1. plays.

2. drink.

3. starts.

4. live.

5. do.

6. speak.

7. watches.

B5

1. does -> do.

2. Do -> Does.

3. watch -> watches.

4. goes -> go.

5. carries -> carry.

6. don't -> doesn't.

7. plays -> play.

8. are -> is.

?

1. In spite of getting up early, he was late for the first train (Cấu trúc In spite of +V-ing)

2. Despite being an excellent doctor, he can’t cure lever cancer. (cấu trúc despite+ving)

3. How far is it from Vinh to HN?

4. I used to walk to school when I was small (cấu trúc used to+ to V)

Coi $n_{Fe_xO_y} = 1(mol) \Rightarrow n_{O(oxit)} = y(mol)$
$Fe_xO_y + 2yHCl \to xFeCl_{2y/x} + yH_2O$

Theo PTHH : 

$n_{HCl} = 2y.n_{Fe_xO_y} = 2y(mol) = 2n_{O(oxit)}$

(Điều phải chứng minh)

Ủa alo

Tui làm rồi mà

cái này bạn gửi ở dưới rồi còn gì

ABC cân vì có AB = AC

OAD đều vì nó là tổng 3 tam giác cân cộng lại.