_____ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
After the meeting, she invited us to dinner at her home and treated us _____ many exotic foods we _____ before. It was really a wonderful treat.
_______not to be late for the meeting, we arrived forty minutes _______ the required time, but after _____seemed hours of waiting, we were informed the meeting had been canceled.
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 _______.