A turning point of the continuously high housing price won't appear suddenly because there must be a certain process _ many factors lead to the change.
_______ of people in the world are sending information by E-mail ever day.
About _______ of the surface of the earth _______ covered with water.
It will take _______ time to finish the work.
--- How long will your stay here ? ---For ________ .
When he moved to Germany in ______ , he was already in _______ .