stumble

"He is a student of life."

"I lost a few marks in the test for spelling words incorrectly."

"Instruction will be provided on how to handle difficult customers."

"The math worksheet had ten addition problems for the students to complete. "

"The substantial of my grandmother's advice helped me make a good decision. "

"The children were drawing with chalk on the pavement outside their house. "

"He stumbled over a rock."

"The complicated instructions for the new software program confused many of the employees. "

""Many students have problems understanding fractions." "

"The students' high scores on the math test were confounded by the fact that they all had access to the answers beforehand. "

"He clumsily spilled his milk while reaching for the cereal box. "

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