____I had done it , I knew I had made a mistake.

-- I am going to Sidney for further studies next month.-- That’s fantastic. Can you keep emailing me ______ you are there?

Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.

The patient's son asked the doctor the question________his father could survive the big operation.

 Though having discussed it for long, they still haven't reached an agreement ________ they should pour more money into the project.