2188 is a lucky number, ________ I suppose, that will bring us luck and fortune and will be loved by us all.
This old computer must have been of great use to _______ did the scientific research.
--- Do you know _____ Mr. Black’s address is. --- He may live at No. 18 or No. 19 of Bridge Street. I'm not sure of _____.
--- Do you know him?--- Yes, but I can’t remember ________I met him for the first time.A. where B. what C that D. if
They have not made any decision on ______ they are going to do to deal with the waste and control pollution.
Sometimes we are asked ______ we think the likely result of an action will be.