They have never heard such a thing before

1.                 They have never heard such a thing before.

ð    This is the first time ________________________________________________

2.                 Noone has challenged his authority before.

ð    This is the first time ________________________________________________

3.                 She left university 2 years ago

ð    It is _____________________________________________________________

4.                 My mother was the most warm-hearted person I've ever known.

ð    I have ___________________________________________________________

5.                 I haven't been able to see them for over a year.

It is _____________________________________________________________