Answer:
She wondered if someone saw them digging the hole.
Explanation:
From the book "Roll of Thunder, Hear My Cry", the Logan children are oppressed by the driver of the white children's bus who always splashes them water and they decide to dig a hole so the bus would be stuck and the white children would have to walk to school as they did.
Cassie was so worried the night bus got stuck in the mud because she wondered if someone saw them digging the hole.
