She ______ the invitation if she had known it was a formal event.

• might accept

• might have accepted

• might have accepting

They __________ for hours by the time we arrived

• must have been waiting

• must have been

• must be been

He ______ the project yesterday; he looks very tired.

• must have completed

• must be completed

• must have been completed

You ______ more polite with the guests last night.

• should have been

• should be been

• should be

The kids ______ for more than an hour now; they must be exhausted.

• might have been playing

• might be playing

• might have playing

She ______ working late; that’s why her office light is still on.

• could be been

• must be

• could have been

They ______ the announcement by the end of the meeting.

• should have done

• must be done

• should have been done

He ______ the documents, but he didn’t bring them.

• should have printed

• must print

• must have printed

The report ______ on my desk yesterday, but I didn’t see it.

• might have left

• might have been left

• might leave

You ______ spending so much time on social media while working.

• shouldn’t been

• shouldn’t be

• shouldn’t have been