Read the passage and choose the correct answer A, C, C or D.

How can we ___(1)___ our teeth healthy? First, we ought to ___(2)___ our dentist twice a year. He can fill the small ___(3)___ in our teeth before they destroy the teeth.
Secondly, we should brush our teeth ___(4)___ twice a day - once after breakfast, and once before we go to bed. We can also use ___(5)___ toothpicks to clean our teeth after a meal.