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Jack did well on the test. He ____ (study) very hard.
must have studied
He ____ (forgot) about the party! I reminded him about it many times.
couldn't have forgotten
You drove from Seattle to Los Angeles. That ___ (take) a long time.
must have taken
I don't know why traffic is so slow. There ___ (be) an accident, but I'm not sure.
might have been / may have been
What was that noise? It ___ (be) the cat. The cat isn't here right now.
couldn't have been
Mary ___ (go) to school. I was there for the whole day and didn't see her.
couldn't have gone
Tom is late today. He ___ (forget) to set his alarm. I'll call him to check.
might have forgotten / must have forgotten
You hiked for 10 hours? That ___ (be) exhausting.
must have been
I ___ (take) the wrong street, I'm not sure. Let me check the map.
might / may have taken
That letter ___ (be) sent to me. It has my name on it.
must have been
She ___ (look) too hard for her keys. They're here on the table. You can easily see them.
couldn't have looked
She hasn't arrived yet. I thought I was clear, but she __ (misunderstand) my directions. I'll call her to check.
might / may have misunderstood
