1.   Groaning, you notice that the passenger in the seat beside you is plugging headphones into her laptop computer and her ears.

2.   Headphones can be plugged into the front of the speaker.

3.   I logged on again and plugged my headphones into the CD player.

4.   Their mom and I particularly liked that the kids could plug headphones into a console in the back.

5.   When Manny Ramirez listened to his music Wednesday at Camden Yards, he had headphones plugged into his portable CD player.