问题详情

When you were six years old, you had 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to【11】. They"re making way for a new【12】. As new teeth comein, they cut off the【13】supply to the milk-teeth. After a while, the milk-teeth fall out. By the time you are 25, you should have a whole new set of teeth. And you"ll have 12【14】teeth. In all, you"ll have【15】teeth in each jaw.请帮忙给出正确答案和分析，谢谢！