muttered

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The leaky faucet dropped water onto the counter all night. "

"My teacher explained the new math concept, and I understood it perfectly. "

"When he tripped and fell in the street, several kind passers-by helped him up."

"The teacher sighed; the student's poem was well-intentioned, but unfortunately, it was just a piece of light-hearted doggerel. "

"My sister is very helpful, especially when it comes to organizing things. "

"Her expressions of gratitude after receiving the gift made everyone feel happy. "

"He injured himself."

"The student's essay had a few minor imperfections, but overall it was well-written. "

"I could hear the thunder rumbling in the distance."

"The articulation allowed the robot to move around corners."

"The store manager received many complaints about the long wait times at the checkout. "