They _____ for sixteen hours and still have a long way to go.
The victims of the accident demanded that the case _____ into at once and they _____ a reasonable explanation and a just treatment.
The policeman was ________ abusing his power when performing his duty, but it hasn’t been ______ yet.
Only through constant practice can the ability of using a foreign language be _______.
She ________ on her work so much that she didn’t notice that a crowd of people had _______around her.
The doctor, ________ by several nurses, successfully performed the difficult operation on the patient.