Ответ:

2) A: Are there ten students in the classroom?

B: Yes , there are

3) A:Is there a dog in the house?

B: Yes , there is

4) A: Are there four cats in the fridge?

B: No , there aren't

5) A: Is there an orange in the fridge?

B: Yes , there is

6) A: Are there three books in the schoolbag?

B: No , there aren't