Sure! Here are the answers to the exercises you provided:

**Ex 14: Write the negative and interrogative about present simple tense.**

1. I do not (don't) play the piano very well.
- **Interrogative:** Do you play the piano very well?

2. Jack does not (doesn't) play the piano very well.
- **Interrogative:** Does Jack play the piano very well?

3. You do not (don't) know the answer.
- **Interrogative:** Do you know the answer?

4. She does not (doesn't) work very hard.
- **Interrogative:** Does she work very hard?

5. They do not (don't) do the same thing every day.
- **Interrogative:** Do they do the same thing every day?

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**Ex 15: Rewrite the sentence in the same meaning.**

1. There are no six rooms in the house.
- **> There aren't six rooms in the house.**

2. The movie is very interesting.
- **> What an interesting movie!**

3. Let’s play some computer games.
- **> How about playing some computer games?**

4. Minh has two days off. Nam has one day off.
- **> Nam has one day off.**

5. I spend 2 hours doing my homework every day.
- **> It takes me 2 hours to do my homework every day.**

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**Ex 16: Gap Fill**

1. Every day Mai **goes** to school in the morning and **does** her homework.
2. Hoa and Lan **wake** up at six and **go** to school at seven o'clock.
3. Minh **reads** books and **watches** television in the evening.
4. At four o'clock, we **play** soccer.
5. In the evening, I **listen** to music and my sister **watches** TV.
6. Nam **does** the housework in the afternoon.

Feel free to ask if you need further assistance!