`26`. The delivery of gas cylinders will be allowed only if it is contained in an appropriate device A. Only if gas cylinders arr contained in an appropriate device the delivery will be allowed B. Should gas cylinders be contained in an appropriate, they will bw allowed to deliver in large quantity C. Only when gas is contained in an appropriate device will the delivery of cylinders be forbidden D. On no account will the delivery be forbidden if gas cylinders are contained in an appropeiate device `27`. I lost her phone number. I couldn't call her A. If I had her phone number, I could have called her B. I wish I had her phone number so that I could call her C. As long as I had had her phone number, I couldn't call her D. If only I hadn't lost her phone number and I could have called her