Choose the most suitable word to complete the passage

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1. Choose the most suitable word to complete the passage.
(1) and
Today, more and more people are learning about the importance of having a clean
teeth. When we eat, our teeth can collect food. If we
(2) clean our teeth, the food collects
between them. This food can start to rot, or
(3). Soon the food starts to create bacteria. Bacteria
can destroy our teeth and our gums, the skin surrounding our teeth. This can cause a lot of
Bacteria may change the colour of teeth. Some people's teeth can
people can even start to lose
can reduce quality of life.
1. A. mouth
2. A. does not
3. A. go well
4. A. paint
5. A. turn
6. A. his
B. nose
B. doesn't
B. decayed
B. pain
B. make
B. our
(4).
(5) yellow or black. Other
(6)! And gums can become painful and bleed. Having bad teeth
C. ears
C. do not
C. get well
C. painful
C. makes
C. your
D. eyes
D. do
D. decay
D. paints
D. colours
D. their