Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
The light is still on. He _____ to turn it off when he _____ the room.
The reason ______he was late for class was not the reason ______he gave me.
She heard a terrible noise,______brought her heart into her mouth.
I have an itch ____ writing.
_____ the lab, we were taken to see the library.