In fact it's ______ for the farm ______ move the stone away.

In fact it's ______ for the farm ______ move the stone away.这两个空怎么填?
An old farmer breaks some plowshares,because there is a big rock in his field for many years.One day,he breaks another plowshare.He is very unhappy.So he wants to move the big rock away.
To his surprise,it is very easy to move the rock.He says,"Why not move it away earlier?"
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