We carefully compared the result of the first experiment with_______ of the second one.

---Are Mr. and Mrs. Wang living alone in the house? ---Yes, they have three sons, but ______ of them live in their own houses.

.---____ did you leave the classroom? ---____ I saw my daughter sit down and read her book. 

Do you know the girl _______is singing in the classroom?

—There are so many flowers on ___________ side of the street．—Yes．I hope that all the flowers belong to _______________．