Tom_________ the shopkeeper with overcharging him for the articles he had bought.

A．Parents increasing children’s language development_________.
B．Reading techniques being simple
C．Parents reading to children
D．Children’s intelligence development

A．The need for labor helped the invention of machinery in America
B．The farmer rejected Charles Newbolt’s plow for fear of ruin of their fields.
C．Both Europe and America had great need for farm machinery.
D．It was in Indiana that the first chilled-steel plow was produced.