If you are traveling_ the customs are really foreign to your own,please do as the Romans do.
Maria has to baby-sit. That’s______ she can't come with us.
--- 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 _____.