sporadic

"The connection between the two classrooms was established by installing a new phone line. "

"The teacher isolated the student who was disruptive, placing him in a separate room. "

"The liftoff will occur in exactly twelve seconds."

"Please completely fill in the box for your answer, using a number 2 pencil."

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

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

"The tomato plants had some kind of disease that left their leaves splotchy and fruit withered."

"Despite my instances that I needed more time, the teacher insisted I turn in the assignment by the end of class. "

"The crowd scattered in terror."

"He wanted to exhibit his baseball cards."

"The spilled marbles were scattered in a completely patternless arrangement across the floor. "

"The frequent occurrence of noisy construction near my house has made it hard to concentrate on my studies. "