Past Possibilities: Modal verbs Challenge

 Tom is late for the meeting. He __________ forgotten about it.

He didn't pass the exam. He __________ studied harder.

The package is not here. It __________ been delivered yet.

They __________ attended the party last night; their car is in the driveway.

We __________ listened more carefully; now we don't know what to do.

The keys are not on the table. You __________ left them in the car.

Sarah is not in her office. She __________ gone to lunch.

He looks upset. He __________ received bad news.

They __________ taken the wrong train; they are now in the wrong city.