She _______ have left her keys at home. I saw her pick them up earlier.

• must
• could
• can
• may

You _______ have finished your homework before coming to the party.

• can
• could
• must
• might

He _______ have gone to the store, but I’m not sure.

• can
• could
• may
• must

They _______ have been sleeping when the phone rang. I didn’t hear anything.

• may
• might
• must
• can

She _______ have helped him with the project. He seemed to manage it alone.

• must
• could
• can
• might

She must have taken the wrong bus; I saw her leave earlier.

He could have been at the meeting, but he didn’t show up.

They may have gone to the movies, but they didn’t tell anyone.

He must have _____ the train because he was late to the station.

• missed

You could _____ told me about the problem earlier, so I could help you.

• have