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In recent years， with the development of technology，many popular apps（应用程序） have been produced． These days， an app has caught great attention． It is douyin， a video sharing app． Douyin first （1） in 2016． Now it is many people's favorite app，（2） the young．
With Douyin， users can record videos， edit （编辑）them and （3） them online． It is very easy （4） interesting． We can share our videos with our friends with just a tap on the mobile phone screen． What's more， it's a great way to spend our free time by （5） through those funny videos．
However， every coin has two （6） ． The app also has bad things． On the one hand，some people spend long hours （7） the app， which is harmful for their health． On the （8） hand， users can also find some bad things on the app． Such thing is unsuitable and meaningless．
In my opinion， Douyin should check the videos （9） they are uploaded（上传）in order to keep a healthy environment for its users．Douyin is not （10） for teenagers． We should not use it too often．
It is very for me to have conversations with friends in English every day． My speaking skills have certainly improved． （help）
Jimmy could not sleep at first． He finally fell when the rainstorm stopped at midnight． （sleep）
Every year， about 6.5 million people die because of air ．（pollute）
An American father made pretty dresses for his daughter out of his old shirts．（wife）
The oceans are polluted by plastic waste． （heavy）