1. Now that we're started this tradition, we need to keep the ball rolling.

2. Now that we've started this tradition, we need to keep the ball rolling.

3. I put in a word now and then to keep the ball rolling.

4. We must try everything we can to keep the ball rolling.

5. "Don't mind if I do, old man, " said the great leader, "just to keep the ball rolling.

6. For various reasons, quite a few members of the school drama group had quit; but somehow we managed to keep the ball rolling.