The movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer.

Which sentence is in the present tense?
A. She sang while she hiked and hoped it would scare the bears away.
B. I sing in the shower every morning.
C. Will they be singing the anthem live or lip-synching?
D. The excited crowd didn't know all the words but sang along anyway.