The correct answers are Humans usually sleep at night, but my human roommate is studying right now. and I am living in a university dorm this semester, but humans generally live in houses.

Explanation:

• usually sleep / is studying: Present Simple is used for routines ("usually sleep"), while Present Continuous is for actions happening right now ("is studying").

• am living / generally live: Present Continuous is perfect for temporary situations ("this semester"), while Present Simple is for permanent facts or general truths ("generally live").

• is boiling is incorrect because scientific facts and general truths require the Present Simple ("boils").

• learn... this week is incorrect because a temporary, ongoing action around the present time requires the Present Continuous ("am learning").