Sir, you ______be sitting in this waiting-room. It is for women and children only.
--- I rang you at about ten, but there was no reply. --- Oh, that was probably ____ I was seeing the doctor.
15. _______ all the inventions have in common is _____they have succeeded. A. What; what B. That; that C. What; that D That; what
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