The entire plan hung on their ability to keep their numbers unknown.
As long as everyone could stay quiet, their size would come as a surprise.
The were quite a small group and had to stay hidden so that none would be killed.
Pulverizing limestone to use in the U.S.
History is alive.
The woman is outside.
A boy is playing a guitar.
The roads are smooth and free from bumps.
He did not understand the joke.