---______is this girl?---she is my sister.----______do you spell “sister”?---S-I-S-T-E-R.
There are many tall buildings on ____ sides of the street .
---Would you like milk or juice? ---__________ is OK. I really don’t mind.
There are some trees on one side of the road and some factories on _____.
— Is your father or mother a teachers? — . My father is a doctor and my mother is an office worker.
Some students are playing football. _______are doing their homework.