Read this paragraph. Biology 101 with Professor Ramirez is the most challenging course I have ever taken. Though every inspiring class session includes exhaustive note taking and time-consuming lab work, I enjoy the material. The entertaining lectures are instructive, and all the students remain engaged throughout the hour.

Which words from the paragraph support the conclusion that Professor Ramirez is a demanding teacher? Check all that apply.

challenging
inspiring class session
exhaustive note taking
time-consuming lab work
entertaining lectures
engaged