ALC 19 L2 Perfect Modals (from hw)

I called Fred's house but no one answered. He _____ gone out.

• must have

• couldn't have

Jill seemed very tired today. She _____ slept well last night.

• must have

• couldn't have

Kelly had a lot of baggage. She _____ been traveling for weeks.

• must have

• couldn't have

Kevin received good grades. He _____ worked hard.

• must have

• couldn't have

Our teacher was absent yesterday. She _____ been sick.

• must have

• couldn't have

Sally's plane took off very late. She _____ arrived home on time.

• must have

• couldn't have

Jim was in an accident, but he wasn't driving. He _____ caused the accident.

• must have

• couldn't have

Melissa applied for a job at a bank, but they _____ hired her because she doesn't have any experience.

• must have

• couldn't have

Jane wasn't at work yesterday. She _____ sick.

• must been

• could have be

• could have been

There was a loud noise in the other room. It _____ the cat.

• may have be

• may have had

• may have been