____ he comes to Nanjing he will go to the Eastern Suburb for sightseeing.
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 _______ .
My brother lives in ______ on ______ floor.