语法填空

     One day a rich man took his son on a trip to the country. He wanted to show his son how the poor

lived so he could be thankful __1_ his wealth.

     They spent a couple of days and nights on the farm of   2   would be considered a very poor family.

     On their return the father asked his son   3   (explain) what he had learnt. The boy, who had remained

silent and deep in thought on the journey home,   4  (reply) in a way that shocked his father.

      The boy said he wanted to become a farmer. He envied the farmers who had the beautiful night stars

to give them light   5   his family had only expensive lanterns. His wish was to have a farm    6   he could

go swimming in an endless river instead of the garden pool in their home. Finally he asked his father, "

What makes us safer, large walls around our house   7   friends that will protect us?"

      The boy finished by saying, "   8    the trip I thought we were rich, but today I learnt who is  9  (true)

rich." With this the boy got up and walked away, leaving his father sitting on their comfortable sofa, totally   10    (speech)．