阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或填入括号中所给单词的适当形式（每空不多于3个单词）。
One day,
a student asked his teacher, "What is greed(贪婪)?"
The teacher didn't answer his question {#blank#}1{#/blank#}(direct),
but asked the student to walk through the chocolate factory next to their school
and pick out the {#blank#}2{#/blank#}(big)
chocolate bar(条；块) he could find. But there was a rule:
{#blank#}3{#/blank#} he passed through the factory, he could not turn
back.
The student
went to the chocolate factory. As he walked, he saw a large chocolate bar. He liked
it, but thought he might be able to find an even bigger one if he kept going.
He kept
{#blank#}4{#/blank#}(walk) and saw another chocolate
bar. This one was a little bigger. But again, he thought he could find an even bigger
one if he kept going. As he neared the end of the factory, he saw {#blank#}5{#/blank#}(few) chocolate bars, and none of
them were as large as the earlier ones. He started {#blank#}6{#/blank#}(regret)
his decision to keep going. Finally he gave {#blank#}7{#/blank#}.
He went back to his teacher empty-handed and {#blank#}8{#/blank#}(explain)
what had happened.
The teacher
told him, "You liked the {#blank#}9{#/blank#}(one)
chocolate bar, but you kept looking for a bigger one. And later, you realized {#blank#}10{#/blank#} you had given up the best chocolate bar because
you thought you could do better. That is called greed."
