A．Demonstrate how the product works.
B．Invite a volunteer to try the product.
C．Move on to talk about another product.
D．Ask another person to explain it in detail.

A．The man who has a high opinion of himself.
B．The man who has risen to the top through his own efforts.
C．The college professor who wins great respect from common workers.
D．The leader in business who occupies a higher social position.

A．Because servants in America are hard to get.
B．Because she can hardly afford a servant.
C．Because she takes pride in what she can do herself.
D．Because it is easy to prepare a meal with canned food.