--- How much shall I pay for the phone call? --- You ________. This is free of charge. 

Keep up good state of mind even if you _____ fail plenty of times.

 —Did you tell Rose about the test? —Oh, no, I forgot. I          call her now.

I was too busy at that time, ________ I would have given you a hand.

—Shall I inform him of the change of the schedule right now? —I am afraid you _______,in case he comes late for the meeting.