fluctuate

"My car needs gasoline; I'll fill it up before going to school. "

"Consider that we’ve had three major events and the year has hardly begun."

"She needs two more degrees to become a fully qualified doctor. "

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

"The student was irresolute about which college to apply to, unsure of which program would best suit her interests. "

"The teacher explained the lesson thoroughly throughout the entire class period. "

"The wind made the tall grass undulate like a green ocean. "

"We would like to go skiing, but it depends on the amount of snow."

"The temperature in the room dropped nearly 20 degrees; it went from hot to cold."

"The price of gas fluctuated wildly this week, going up and down several times a day. "

"The children's bedtime was irregularly scheduled, sometimes at 8:00 pm, sometimes at 9:00 pm. "

"After careful consideration, the student made a decision about which college to attend. "