Professor Smith, along with his assistants, __ on the project day and night to meet the deadline.
He was honest and told us ______ he knew.
She may have missed the train, in _______ case she won’t arrive for another hour.
The best job is _____ which uses your skill in doing something together with your interest in the subject.
Living in the central Australian desert has its problems, _____ getting water is not the least.
_____ could be judged from what he had said, he felt terribly sorry for what he had done.