1.Chọn và điền các từ dưới đây vào hội thoại: “cause;decay;eat;middle- aged;pulled;sugar;teeth;thought;treat;wear."
Many people nowadays have to_________false teeth when they are_________. The reason is that tooth________increases a lot. The sugar is chief________of tooth decay. Eskimos'_________, for example, when they began to________sweeter food.
Long ago doctors didn't like to________people's teeth. People's teeth and_________them out when they decayed. Some people_________toothache was a punishment from the gods.
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Sinh Học lớp 12
