In ancient times, dogs were mainly ______helping people hunt( 打猎) .Now they are more useful-they can help the blinds, search for the bad eggs,…

___________ was no doubt __________ someone had broken into the store the day before.

The girl is crying _______ her hands on her stomach. [ ]

You are _to type quickly when talking to each other on QQ so the other person doesn’t get bored.

Be careful not to knock____________each other, kids.[ ]