Here are the correct word forms to complete the conversation:

5. David/ want some coffee? => **Does David want some coffee?**
6. she/ have three daughters => **Does she have three daughters?**
7. when/ she/ go to her Chinese class? => **When does she go to her Chinese class?**
8. why/ I/ have to clean up? => **Why do I have to clean up?**

For the second part of the exercise:

My cousin, Peter, (have) **has** a dog. It (be) **is** an intelligent pet with a short tail and big black eyes. Its name (be) **is** Kiki and it (like) **likes** eating pork. However, it (never/ bite) **never bites** anyone; sometimes it (bark) **barks** when strange guests visit. To be honest, it (be) **is** very friendly. It (not/ like) **does not like** eating fruits, but it (often/ play) **often plays** with them. When the weather (become) **becomes** bad, it.