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.

1)challenging
2)inspiring class session
3)exhaustive note taking
4)time-consuming lab work
5)entertaining lectures
6)engaged