阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。

　　Two brothers-one a bachelor，the other married-owned a farm whose rich soil yielded(生产)a lot of grain.____1____ of the grain went to one brother and half to the other.

　　All ____2____ well at first.Then every now and then，the married man began to wake from his sleep at night and think，"This isn't ____3____．My younger brother isn't married，he's all ____4____，and he gets only half the produce of the farm.Here I am with a wife and five kids，____5____ I have all the security I need for my old age.But who will ____6____ my poor brother when he gets old？He needs to ____7____ much more for the future than he does at present，so his need is ____8____ greater than mine."

　　9____ that he would get out of bed，____10____ over to his brother's place and pour a sackful of grain into his brother's granary(粮仓)．

The bachelor brother ____11____ began to get the same ____12____.Every once in a while he would ____13____ from his sleep and say to himself，"My brother has a(n) ____14____ and five kids and he gets only half the produce of the farm.Now I have no one except myself to ____15____．So should my poor brother，whose need is clearly greater than mine，receive ____16____ as much as I do？