阅读下面的短文,在空白处填入一个适当的词,或填入括号中所给单词的正确形式。
A great app(应用软件)
If you are a little scared when you walk alone at night, you can phone your family to make sure they know you are safe. But ____(make) calls may make your target(目标)for bad people.
Now there is an app that lets your family____ (know) your journey. And it will call when it feels you're ____danger.
The app is called Companion(同伴). Before you start your journey, you put your starting place and your finishing place into the app. Then you send ____to your companion. The companion can be anyone in your phone book, and they don't need____ (have) the app.
The app will tell your companion____you are at any time. And it will show a button on your phone screen every few ____ (minute), asking “Are you OK?” If you don't press the button in 15 seconds, your companion ____ (get) an alarm. And the app will be ready to call the police for ____.
With the app, you will never be____ (worry) about going home alone.