wiping

"The heavy rain seemed to obliterate all the chalk drawings on the sidewalk. "

"The student was being dishonest when he claimed he didn't cheat on the test, even though he was looking at his neighbor's paper. "

"The student used a microscope to see the tiny cells in the plant leaf. "

"He discovered penicillin largely accidentally."

"The store owner overpriced the handmade toys, charging twice what similar items cost elsewhere. "

"The scientist carefully examined the substance to determine its chemical composition. "

"The teacher is maintaining discipline in the classroom by reminding students of the rules. "

"The computer technician fixed the broken printer in the school library. "

"My sister's joyful expression showed how happy she was about the good news. "

"It’s easy to promise anything when you have no intention of fulfilling any of it."

"My raincoat has a good waterproof to keep me dry in the rain. "

"The large oak tree surrounding the picnic area provided welcome shade. "