9．
用括号内所给单词的适当形式补全短文。
Do you know how to take care of
your teeth? The following are some tips for you.
Brush at least twice a day-after
breakfast and before bedtime. When you (brush)
teeth, be sure to brush all of your teeth，not just the front ones. Spend some time on the teeth along the
sides and at the back. You need (spend) at least three minutes every time when
you brush.
It's also important (visit)
the dentist(牙医) every six months. Besides (check) for signs of diseases, the dentist
will help to keep your teeth (clean)
and can (teach) you the best way to brush. In order to
(keep)
your teeth healthy, you also need to be careful about what you (eat)
and drink. Remember, the plaque(齿菌斑) on your (tooth) is just waiting for that sugar to
arrive. It's much better (eat) lots of fruit and vegetables and drink
water instead of soda.
