Nobody knows why the boy can tell what’s written on the paper in another room without looking at it. It really _______ explanation.
Now what we need is something __________ will make human beings live better.
—Would you like to play bridge with us? —Sorry. __________.
Please let me know __________ you want to go or not.
It took __________ building supplies to construct these energy-saving houses. It took brains, too.
__________ is a good chance that I'll finish the work tomorrow.