根据下面短文内容，在短文的空格处填上一个最恰当的词，使短文完整、通顺。

Miss Wang recently had a worrying experience.

One morning, just as she arrived at her ___(1)__, Wang noticed some missed calls from her mother. “It must be something very important,” she thought to herself.

Right away, she called her mother __(2)__ quite worriedly. To her surprise, Wang found her mother only wanted her charger (充电器), which Wang took to the office by mistake.

When Wang hurried home from her office, she found her mother’s __(3)__ was still 70% charged. And her mother was worried that it would run out of power as she continued using it.

Now Wang realizes the seriousness of the problem. Her mother ___(4)___ eight hours a day playing games, reading news and watching short videos online. And her mother has problems like poor eyesight, headache and so on.

This story is not special and Wang’s mother is not ___(5)__. She is just one in a growing population of the old who lose themselves in playing with phones. As the old have ___(6)___ chances to join in social activities, a smart phone is the best way to kill time.

But too much time on phone can cause many problems. “Be careful when using your phones, ___(7)__ you will be easily fooled!” Although the old are always warned like this, online frauds (欺骗) still happen to them. Now there are more family problems. Action should be taken.

For the old, they should control their screen time and get enough rest. The young, for their part, should often visit the old, and help them learn more about online safety so that they can ___(8)___ themselves. Also, the young can do more activities with the old like talking, walking and traveling, or encourage them to learn something at the universities for the aged.