ex 1
1. by
2. on
3. by
4. on
5. between
6. under
7. next to
8. around
9. behind
ex 2
1. on, in
2. on, at
3. in
4. at, at
5. in, on, on
6. by, at
7. in, in
8. behind, in front of
9. on, through
10. at, among
