boy and ...?
boy and girl
front and ...?
front and back.
cold and ...?
cold and hot.
top and ...?
top and bottom.
closed and ...?
closed and open
big and ...?
big and small
... and small.
big and small.
tall and ...?
tall and short.
day and ...?
day and night.
full and ...?
full and empty.
hard and ...?
hard and soft.
laugh and ...?
laugh and cry
sweet and ...?
sweet and sour.
near and ...?
near and far.
happy and ...?
happy and sad.
go and ...?
go and stop.
up and ...?
up and down.
fast and ...?
fast and slow.