Mỗi câu có 1 lỗi sai. Tìm nó và sửa nó

Mỗi câu có 1 lỗi sai. Tìm nó và sửa nó
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 teacher 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 game 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 to busy.
9. There are less TV programs for teenagers than there are for adults.
10. People are living longer so there are more and more many old people.
HELP ME!!!!
~~~THANKS MN~~~