wobbles

"The books on top of the piano resonate when he plays certain notes."

"My sometimes neighbor, a retired teacher, still visits the school occasionally. "

"The strong gust of wind unsteadying him as he walked across the bridge. "

"The student began to vacillate between choosing the easy math problem or the challenging one, unsure which would be the best use of her time. "

"The frequency of bus service has been improved from one every 15 to one every 12 minutes."

"Her voice was tremulous as she announced she had won the scholarship. "

"My friends and I have different opinions about which restaurant to go to for dinner. "

"The children excitedly opened their birthday presents. "

"The tadpole changed into a frog.   Stock prices are constantly changing."

"The gentle oscillation of the fan blades cooled the room. "

"While I studied, my roommate listened to loud dubstep with heavy bass that vibrated through the floor. "

"The phone vibrated on the desk, signaling an incoming text message. "