1. isn't 
2. is having 
3. comes 
4. are 
5. are singing 

31. The dog is behind the door.
>>The door is in front of  The dog
32. Lan's family has five people.
-> There are  five people in Lan's family
33. Her eyes are big and brown.
→ She has big and brown eyes 
33 Her hair is long and curly
>She has  long and curly hair
34. My best friend has new shirt.
This is my best friend's new shirt.