It was two years ago when I first saw the Great Wall.
It_____two years ______ I first saw the Great wall.
The new building is 400 metres high.
The new building is 400 metres ______ ______.
It was two years ago when I first saw the Great Wall.
It_____two years ______ I first saw the Great wall.
The new building is 400 metres high.
The new building is 400 metres ______ ______.
is since
in height
1. has since