The father seldom had time to share with his children, because he devoted most of his time _______ research in his lab.

— Just now Jenny gave ten dollars to a person in trouble.— She________others. [ ]

I have no brothers _____ sisters.

__ number of people who___ killed or injured reached more than 400,000.

People complain that decisions to approve or deny apermit are often ____ rather than based on fixed criteria.