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Подставить правильно at,on, or in...

Are the plates .....the cypboard?
Look at the example...the board.
I met my girlfriend ... a party.
Kathy`s not here-she`s .....work at the moment.
Are my books ....that shelf?
My toothbrush isn`t ....the bathroom .Where is it?
She usually sits ...the floor.
Is your daughter happy ...school?
We had breakfast ,,,the garfen.
There are too many cars...the road.