题目内容
12. I never need _______ for toothache because my teeth are OK. I go to my dentist twice a year.
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13. A healthy river is ______ fish.
14. There are no appointments _______ at the dentist's this afternoon. You will have to wait until tomorrow.
15. My grandmother has got a new computer and now she spends her day visiting social ____.
16. I don't go to the ______ very often as it has become very expensive.
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