How can you play football in such a crowded street? I think you need a _______ place.

The headmaster was dismissed three months ago.The post is too important to leave __________ any longer,especially before the college entrance examination.

It was really _____ of your brother not to play the guitar while you were preparing your lessons.

. Many people think that it is ____________making such an experiment.

David felt ________of the foolish thing he had done in the classroom.