—The best things in life are free.
—Couldn’t agree more. Air costs ______, but we can’t live without it.
something
nothing
anything
everything
People were running in all directions ________ pieces of glass were falling down.
The food smells ________, so do not eat it any more, Jack.
I’m very happy that my lost pet bird arrived home ________ a snowy morning .
Timmy is ________ honest boy, he never tells a lie.
—Happy birthday! — ___________________.