Verified answer

2) There are meatballs on the plate. (meatballs - множествен. число, поэтому пишем без артикля "a")

3 и 4 у вас написано правильно

5) There is a bird in the cage.

6) There is a car near our house.

7) There are two shops in the street.

8) There are four boys in the group.