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1. The dentist filled the cavity in my tooth and it stopped hurting afterwards. 
2. "Balanced diet " means you eat a variety of foods without eating too much of anything. 
3. Walking is a fun, easy and inexpensive activity, all people of all ages and abilities can enjoy it.
4. After the invention of special breathing equipment, man could swim freely underwater .
5. Hoa's family doesn't have a TV because her aunt and uncle don't like watching it.
6. Children shouldn't spend too much time on video games because they can become tired or dizzy .