There is one mistake in each of the following sentence

V. There is one mistake in each of the following sentence. Find and correct it.

1. Tim is at the same age as Hoa.
2. At recess, the students practice to play basketball.
3. Do you know how much a banana cost?
4. The tacher says Ba will be a famous artist in one day.
5. Some boys are playing marble in the school yard at recess.
6. Some students are playing games as blind man’s buff and catch.
7. Mai learns how to use a computer in her scientific class.
8. I’d love coming to your birthday but I’m much too busy.
9. There are less TV programs for teenagers than there are for adults.

      People are living longer so there are more and more many old people.