80%
Help Sarah figure out what happened in her apartment while she was at work by selecting the correct logical conclusions.
My roommate's winter coat and car keys are still on the table, so she _________________________ left for her weekend trip yet. However, the television screen is warm. She _________________________ turned it on this morning, or maybe it was just my cat sleeping on top of it again.
The correct answers are can't have and might have.
Can't have is correct for the first blank because the presence of her coat and keys makes it logically impossible that she has already left.
Might have is correct for the second blank because it expresses a 50% possibility in the past—Sarah isn't sure if her roommate turned on the TV or if the cat made it warm.