How can we ..........(1) our teeth healthy? First, we should see our dentist twice a year. He can fill the small ...............( 2 ) in our teeth before they destroy the teeth. Secondly, we should brush our teeth at least ..........(3)a day – once after breakfast, and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good..(4 )........... our teeth and our body: milk, fish, potatoes, raw vegetables and fresh fruit. Finally, we .....(5 )........eat too much candy.
1.A. keep B. keeps C. keeping D. to keep
2.A. cavity B. cavities C. thing D. things
3.A.once B. twice C. three times D.four times
4.A. at B. on C. for D. to
5.A. should B. shouldn’t C.must D.can
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Sinh Học lớp 12
