Question

4)complete with is there or are there: a) a class in the room? b) any windows in the room? c) Seven days in a week? d) an orange in the box?​

Answer 1

a)is there a class in the room?
b)are there any windows in the room?
c)are there seven days in a week?
d)is there an orange in the box?

Answer 2

a) Is there a class in the room?

b) Are there any windows in the room?

c) Are there seven days in a week?

d) Is there an orange in the box?

Explicação: No inglês, quando está no plural se usa "are" e quando está no singular, se usa "is", então é só analisar a frase.