strong

"The teacher determined the parameters of the history project, specifying the required length and number of sources. "

"The teacher's interesting presentation stimulated the students to ask many questions. "

"The strong undercurrent of the river made it difficult for the swimmer to stay afloat. "

"The child was unyielding in his desire for a cookie before dinner, no matter how much his mother tried to reason with him. "

"My teacher explained the new math formula specifically for students in the advanced class. "

"My concentration was high during the important math test. "

"Despite the heavy rain, the old tent was withstanding the storm. "

"The main ingredient in Grandma's famous chocolate chip cookies is butter. "

"If you don't study for the test, the consequences will be a bad grade. "

"The explanation was long and drawn-out."

"The presentation about the new school rules was very clear and easy to understand. "

"The foundation of his institute has been wrought with difficulty."