Which of the following is NOT mentioned as important to success（）

单项选择题To encourage the elephants to paint well, the keeper（）

A．bought them a lot of art supplies
B．made them excited at the beginning
C．taught them to hold a paintbrush with their trunks
D．reinforced the desired behaviors with rewards

单项选择题How did Ruby paint at the very beginning（）

A．She used a stick to draw in the dirt.
B．She spent much time in the dirt.
C．She stimulated herself every day.
D．She painted with her keeper's art supplies.

单项选择题Millions of Americans flock to their drugstore to buy vitamins and minerals, （）that these pills can help to prevent serious illnesses.

A．convincing
B．convinced
C．to convince
D．to be convinced

单项选择题If they had sent a check to the telephone company last week, their telephone （）out of service at this moment.

A．will not be
B．will not have been
C．would not be
D．would not have been

单项选择题The extensive survey suggested that their assumptions （）totally wrong.

A．were
B．be
C．was
D．would be