阅读下面短文然后从各题所给的三个选项中选出最佳选项。

Helen 's favorite food is chocolate. Her parents and teacher often say that it's        for her teeth to eat too much chocolate. But she doesn't believe it. She often puts some chocolate in the milk for breakfast, the juice         lunch, even the soup for supper. Her mother has to        some chocolate in her bag before she goes to school. Sometimes when her mother goes shopping with her, Helen won't leave the shop        her mother buys some chocolate for her.
The little girl        back from school with a painful(痛苦的) look yesterday afternoon. A tooth hurt and she had nothing. Her mother made some soup for her. But she put some chocolate in it. Her father bought some       for her, but she put some chocolate in it, too. Of course it was useless.       the next morning her mother took her to see the      .The dentist saw there was a cavity(洞) in her bad tooth .So he had to fill（填充）it with something.
“Now, young girl,” said the dentist , “What kind of filling（填充物） would you like for that tooth ?”
“     , please,” answered Helen. The dentist and Helen’s mother both laughed. The dentist asked Helen to eat fresh fruit and vegetables        chocolate. And it’s necessary for Helen to have healthy eating habits.
A. good    B.  bad C.  well
A. for B.  with    C.  at
A. get B.  put C. buy
A. when    B.  if C.  until
A. go  B.  came    C.  returned
A. medicines   B.  pills   C.  medicine
A. But B.  So  C.  And
A. doctor  B.  nurse   C.  dentist
A. Chocolate   B.  Milk    C.  Fruit
A. instead    B.  but C.  instead of