It's easy to take your hearing for granted until it's too late.
With the wide    16  _ (popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music    17   running in the park or using public transport. And the volume is often    18  loud that people around them can hear the music as well.
However, doctors warn that such behavior can potentially damage    19__ hearing. "Innoisy places, people tend   20 _(turn) the volume up to get the same clarity of sound. Unfortunately, that can damage the hearing   21  people being aware of it," said Feng Yongfeng, chief ENT physician at Beijing Tian'an Hospital.
After Spring Festival, the hospital witnessed    22  slight increase in the number of teenagers coming in with hearing problems,    23  Feng attributed to them wearing headphones at home for long periods during the holiday. Feng said both in-ear and overhead headphones can harm the ears and    24  (advise) against using them for long periods. He said if you do use headphones it is worth  25  (invest) in the highest quality you can afford.