surreptitiously

"The student made surreptitious notes during the lecture, trying not to be seen by the teacher. "

"The court returned a sentence of guilt in the first charge, but innocence in the second."

"She secretly hoped he would ask her to the dance. "

"During class today the professor delivered an interesting lecture."

"The teacher's monotone voice bored the students during the long history lecture. "

"From Earth, we could observe maria, the dark, ancient lava plains on the Moon, with just a pair of binoculars. "

"Check the oil in your car once a month."

"The student furtively glanced at his neighbor's test paper, hoping the teacher wouldn't notice. "

"My sister learned to write in a very careful manner. "

"The teacher gave a good example of a sentence using the past tense. "

"The student stealthily copied the answers from the neighbor's paper during the test. "

"The storm during all night. "