keep at

I keep meeting more and more people where that seems to be the case.

She was growing accustomed to like shocks, but she could not keep the mounting color back from her cheeks.

And it was no light task, then, for six hundred men to keep the peace on a thousand miles of frontier.

He will keep the sayings of renowned men, and will enter withal into the subtilties of parables.

Keep closely covered with a bell glass and, in a few weeks, more or less, the baby Ferns will start to put in an appearance.

My thought was to keep pushing in troops from "W" Beach until the enemy had fallen back to save themselves from being cut off.