Every now and then synonyms

The province produces much wheat, barley, rice, millet, cotton, but the authorities every now and then prohibiting the export of cereals, the people generally sow just as much as they think will suffice for their own wants.

His talk was generally grave, but every now and then was lit up by dry humour.

He ranges freely about the world, touching the laughable sides of things with kindly laughter, and every now and then dropping the risibile and taking to the rationale.

The opium must not be burnt or made too dry, but roasted gently till it looks like burnt worsted; every now and then he takes it away from the flame and rolls it (still on the end of the dipper) on the flat surface of the bowl.

During long easy runs, you could include some faster cadence every now and then.