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A．8:30．
B．9:00．
C．9:30．D 10:00．
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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.
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Many Chinese people are spending plenty of time in______(learn)English．
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