She heard the key in the door and then they were inside the apartment.

Stay inside the apartment, no matter who or what comes to the door.

They found him inside his apartment when he didn't report for work today.

She spent days alone inside her apartment, not talking to anyone.

Inside the apartment everything was exactly as he had left it.

Inside the apartment, everything was the same as he'd left it.

Minutes later, one of the troops asked him to go inside the apartment and see what had happened, he said.

"Did you find anything inside your apartment at that time?"

She led him inside her apartment and closed the door.

I can't tell if anybody else is inside the apartment.