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"The dry-stone wall used a large, flat through to support the top stones. "

"The children alternated reading aloud from their books in class. "

"The graphic designer carefully prepared the mechanical for the company brochure. "

"My laptop needs a new battery; it only lasts for a few hours now. "

"The children were running to catch the school bus. "

"The ancient Romans used a powerful siege engine to break down the city walls. "

"The current of air coming from the open window is making the papers on my desk flutter. "

"There will be a charge of five dollars."

"By now, you must surely know which is which."

"Our apple tree produces a lot of fruit every summer. "

"The new software is a generator of innovative ideas for students' projects. "

"We had to sit in the dark because the electric was cut off."