Dorothy was always speaking highly of her role in the play, ______, of course, made the others unhappy.
Rather than ___ on a crowded bus, Tom always prefers __ a bicycle.
Perseverance is a kind of quality --- and that’s ________ it takes to do anything well.
A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.
How did you ___ to paint the whole house in a week?
Black clouds had completely ___ the sun.