Đáp án:

Practice:

I.

1. didn't cook.

2. didn't work.

3. didn't use.

4. didn't climb.

5. didn't open.

II. 

1. My mum didn't listen to music last night.

2. My classmate didn't walk to school yesterday.

3. I didn't study Math last week.

4. My friends andI didn't play badminton last month.

5. This class didn't start yesterday.

III. 

1. A: Did.... help...?

    Q: Yes, she did.

2. A: Did... finish..?

    Q: Yes, they did.

3. A: Did.. start...?

    Q: No, it didn't.

4. A: Did.. enjoy...?

   Q: Yes, I did.

5. A: Did... rain...?

   Q: No, it didn't.

IV. 

1. What time did your school start? 

   7:00 a.m

2. Did you use a computer last night?

    No, I didn't.

3. What did you study yesterday?

   English.

4. Did you visit another country in holidays?

   Yes, I did.

5. When did you finish UNit 5?

  Last night.

B1:

1: Didn't cook

2: Didn't work

3: Didn't use

4: Didn't claim

5; Didn't open

B2:

1; My mom didn't listen to music yesterday

2: My classmate didn't walk on street yesterday

3: I didn't study at school yesterday

4: My friends and I didn't play football few days ago

5: This class didn't start at 7AM

B3:

1: Did/help

 ->   Did

2:  Did/Finish

  ->   Did

3: Did/ start

 ->   Didn't

4:  Did/enjoy

->    Did

5: Did/Rain

-> Didn't

B4.

1. What time did you start school?

-> I started school at 7Am

2. Did you use a computer last night?

-> No, I didn't.

3.What did you study yesterday?

->I studied Math and Engslish yesterday.

4. Did you visit another country on Holiday?

-> No, I didn't.

5. When did you finish Unit 5?

-> I finished Unit 5 few days ago.