One，day，a farmer was walking along a road with his son Thomas． The father said，"Look ! There-s a horseshoe (31) ．the ground． Pick it up and put it in your bag． Thomas said，"It wastes my time． His father said (32) but he pieked it up himself． When they went to a near- by town，they had a rest．There the farmer (33) the horseshoe and with the money he bought some strawberries．

The father and the son went on walking． The sun was well up in the (34 ) ,They soon drank up their water，and there wasn't a house or even a tree for them to (35) ．Thomas felt too(36) to walk on At this time，his father gave Thomas a strawberry (37) he quickly ate it． After a while，his father gave him (38) strawberry and once again，his son lost no time in putting it in his mouth．

And so they (39) ,The old farmer gave the strawberries and the son ate them．When Thomas had eaten up all the strawberries，his father said to him，"My dear son，if you picked up that horseshoe，you would have your own strawberries (40 )．Always remember the lesson: lf you don't worry about the little things，you'll find it difficult to do the great things． "

( )31．

A．under

B．on

C．for

D．to