I thought he was pondering what I said until he spoke up.
They all sat pondering the strange events.
Edith hesitated, as if pondering her answer.
So the text "the myrmekoleon bath perished for that he had no nourishment" set them pondering, and others reproduced their meditations, with the following result: "The Physiologus relates about the ant-lion: his father hath the shape of a lion, his mother that of an ant; the father liveth upon flesh, and the mother upon herbs.
He had begun to think of the last station and was still pondering on the same question--one so important that he took no notice of what went on around him.