Ответ:

Ex.4.

    Полная форма          Сокращенная форма

1) I have never been         =  I've never been

2) Kate has done              =  Kate's done

3) Have you ever tried ...?

4) I have not                      = I haven't

5) I have not                      = I haven't

6) Has Kate ever gone...?

7) She has not                   = She hasn't

8) She has never ridden   = She's never ridden