根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限填一词。
If you are a little afraid when you walk alone at night, you can phone your family to make sure they know you are s____ But making calls may make you the target (目标) for bad people.
Now there is an app and i____lets your family know your journey. And it will call for help when it feels you're i____danger.
The app is c____ Companion(同伴). Before you start your journey, you input your starting place and your finishing place. Then you s____ them to your companion. The companion can be anyone in your phone book, and they don't n____to have the app.
The app will tell your companion w____you are at any time. And it will show a button(按钮) on your phone screen every few m____asking “Are you OK?” If you don't press the button in 15 seconds(秒), your companion will get an alarm(报警). And the app will be ready to call the police for h____.
With the app, you will never be w____about going home alone.
