Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock?
-----Do you have a minute? I’ve got something to tell you. -----Ok, ______ you make it short.
-----Are you happy with your new computer? ----- No, it is _______ me a lot of trouble.
If you really have to leave during the meeting, you’d better leave ____ the back door.
—Did the book give the information you needed? —Yes. But _____ it, I had to read the entire book.