16) Today, many families don’t have a TV set.
III. Choose the most suitable word to complete the passage (1.5 points).
Today, more and more people are learning about the importance of having a clean __________
(17) and teeth. When we eat, our teeth can collect food. If we __________ (18) clean our teeth, the
food collects between them. This food can start to rot, or __________ (19). 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 ___________ (20). Bacteria may change the color of teeth. Some people’s teeth can
_________ (21) yellow or black. Other people can even start to lose ___________ (22)! And gums can
become painful and bleed. Having bad teeth can reduce quality of life.
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