Because natural disasters occur at random times, it is difficult to warn people _______.
. If you _______wait a moment, I’ll go and find our manager.
. ---Could I use your telephone? --- Yes, of course you ________.
. A modern city has been set up in _______ was a wasteland ten years ago .
. Sarah hopes to become a friend of ______ shares her interests.
. It worried her a bit ________ her hair was turning grey.