unnatural

"The child's perverse behavior at school, refusing to listen to the teacher and disrupting class, made learning difficult for everyone. "

"The liftoff will occur in exactly twelve seconds."

"The outside of the school building was painted a bright yellow. "

"We lit the fire to get some heat."

"The new student was a natural from Japan. "

"The atmosphere was thick with the smell of popcorn, as the kids gathered for the movie night. "

"The flowers were artificial, and he thought them rather tacky."

"The noisy environment of the school cafeteria made it difficult to concentrate on my homework. "

"Her outburst of anger surprised everyone in the quiet office. "

"They completed the first series perfectly."

"My new water bottle is made of plastic. "

"The government's spending on education increased this year. "