&15.
1-c
2-e
3-a
4-b
5-d
6-f
&16.
1) When i was a student i often went to the park with my parents.
2) She had short hair, now shoulder lengh.
3) He used to play hockey, but now is not important.
4) When she was a child, she ate a lot of candy.
5) When i was 6 years old, i read a lot of books.