Đọc và chọn phương án trả lời đúng nhất cho mỗi ô trống để hoàn thành đoạn văn sau (từ câu 6 đến câu 15).

Healthy teeth help us look good and chew well. How can we (6) ________ healthy? Firstly, we should (7) ________ a dentist twice a year. Secondly, we should (8) ________ our teeth at least twice a day- once after breakfast in the morning, and once before (9) ________ to bed. Thirdly, we should eat food that is good (10) ________ our teeth and our body (11) ________ milk, fish, vegetables and (12) ________ fruit. Chocolate, sweets and biscuits are bad when we eat (13) ________ between meals. They are (14) ________ because they stick to our teeth and (15) ________ cause decay. If you follow those tips, you will have clean and healthy teeth.