我会发个消息看看他是否在线。

I'll ___ping him to see if he's online.

我使用ping命令检查服务器是否在线。

I used the ___ping command to check if the server was online.

我刚在微信上给你发了消息，看到了吗？

I just ___pinged you on WeChat, did you see it?