His main duties involved founding and operating schools for the children of slaves.

The main duty is to staff the front information desk of the visitor center.

Their main duty is managing available marketing resources to create a more effective future.

His main duty was to protect the President's office against possible eavesdropping.

One of the players whose main duty is to cover wide receivers.

I remembered what he had said about it being one of his main duties as community chief.

The main duty of the secular clergy was to work in the world.

And each fulfilled the other main duty of a vice presidential choice.

He said that every school in the district had two family workers whose main duty this summer was to increase attendance.

His main duty is to make sure the traditions and practices of the Church are preserved.