Which sentence is in the past tense? a) Squawks and splashes from the birdbath mean the robins are taking their
morning bath.
b) The gentle hum of bumblebees is the perfect soundtrack for a lazy summer
afternoon.
c) A cricket chirped somewhere in the darkness and lulled him to sleep.
d) It is barely dawn, and I already hear chipmunks scampering across the roof
and down the rain spout.