ruefully

"The farmer used the dry straw to insulate the chicken coop. "

"In his anger he pushed me against the wall and threatened me."

"After accidentally spilling coffee on his boss's new shirt, Mark gave a rueful smile and apologized profusely. "

"The baby was feeling the soft fur of the teddy bear. "

"Could you please scratch my back?"

"My biggest regret is not studying harder for the history exam. "

"Could you please scratch my back?"

"The student felt a deep sorrow after failing the important exam. "

"My sister learned to write in a very careful manner. "

"There were many laughing children running on the school grounds."

"Words cannot express the love I feel for him."

"The lightning caused thunder."