Use WHO/THAT/WHICH/WHEN/WHERE/WHOSE/WHAT or nothing.
There is only one Greek island …………. I have never been.
There is only one Greek island …………. I have never visited.
What was the name of the person …………. bought your old car?
This is the last time ……….. I go to this school.
I didn’t know …………. was so exciting about her.
This is the school …………. I used to go to.
There was nobody in the audience …………. laughed.
This is the street ………….. I live.
There is hardly a moment …………. I can have a rest.
This was the first car ………….. I drove.
He was the first man …………… landed on the moon.
She was the last student ………….. I asked.
In the whole book there was only one chapter ………… I was interested in.
It was 1965 ………… they started to build the new school.
Those are the people …………… dog bit me.
There was only one painting ……….. hadn’t been sold.
Do you know the girl ……….. lives next door?
I can’t believe ………… you told me yesterday.
This is the cottage ………… we slept on our holiday.