Bài 2( mik làm lại, bn xem có đúng ko nhé)
1. Where

2. enjoyed- Did

3. How

4. Who

5. went

6.  What

7. gave- had- watched

8. What

9. sang- danced- had- took

Bài 3:
1. join-> joined

2. did( thứ hai) -> do

3. did( thứ hai)-> didn't

4. on-> at 

5. at-> in

Bài 4:
1. h

2. e

3. a

4. g

5. b

6. d

7. f

8. c

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Ex 2 : - Where

         - enjoyed - Did

         - What

         - How

         - Who

        - went

        - What 

        - gave - had - watched

         - What

         - sang - danced - had - took

 Ex 3 : join ⇒ joined

          did ( 2 ) ⇒ do

          No, I did ⇒ No, I didn't

          on ⇒ at

          at ⇒ in

Ex 4 + Ex 1 ( Lesson 3 ) : Trong ảnh

Ex 2 : 1, took

         2, invite

         3, bookfair

         4, presents

         5, played

Ex 3 : 1, At the party, I played the piano and Lam played the guitar.

          2, What do you and your friends do at the book fair ?