The boss ______ the worker how to do it, or the accident couldn’t have happened.
Let Harry play with your toys ______, Clare. You must learn to share.
Steel and iron can be used ______ bridges as well as machines.
Children are always ______, and usually think differently from adults.
I’m sure you ______ to us just now, because we already know the truth.
I have many friends, __________some are businessmen。 A of them B of whose C of which D of whom