Biology is _____.
______ both sides accept these terms will everlasting peace be established in this region.
I could feel my heart beating violently ______ I went on the stage to sing a song.
Please make sure all the lights are ______ before you go to bed.
If you have decided which bike to buy, you can ______ for it on the Internet and we will send it right to your home.
Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours.