1 It's difficult to apply oneself to an uninteresting task.

2 It's difficult to apply oneself to a boring task.

3 It is difficult to apply oneself to a boring task.

4 Where can one apply oneself to achieve human rights progress?

5 One must apply oneself to his work or else he will not enjoy it.

6 One must apply oneself to the present and keep one's eyes firmly fixed on one's future goals.