Security cameras are restricted to ________ spaces，such as hallways and exits.There will be no cameras in classrooms，locker rooms(更衣室)or bathrooms.

He has a _______ knowledge of animals.

        to his scientific research, the professor cared little about his family.

What he said sounds ___.

-- Mike spends a lot of his spare time on computer games.--- So does my son. The children have become hopelessly ________the games.