问题补充：
Its easy to take your hearing for granted until its too late.
With the wide 1 _(popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music 2 running in the park or using public transport. And the volume is often so loud that people around 3 can hear the music as well.
However, doctors warn that such behavior can 4 _(potential) damage their hearing. In noisy places, people tend 5 _(turn) the volume up to get the same clarity of sound. Unfortunately, that can damage the hearing 6 people being aware of it, said Feng Yongfeng, chief ENT physician at Beijing Tianan Hospital.
After Spring Festival, the hospital witnessed 7 slight increase in the number of teenagers coming in with hearing problems, 8 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 9 (advise) against using them for long periods. He said if you do use headphones it is worth 10 (invest) in the highest quality you can afford. popularity
答案：
(答案→)popularity
解析： 略
