He invited some classmates to come to his party, but _________ came.

All children are required to ______ school.

Look! The man at the gate ____ be our headmaster. He is always standing there every morning.– No, it _____ be him. He is holding a meeting in the office now.

It’salready10o’clock. Iwonder howit _________ that she was two hours late on such a short trip.[ ]

The islands developed on theirown for 80 million years and _______ have many rareanimals found nowhere else