Electrolysis(电解)is the process ______ electric current is passed through a substance to cause a chemical charge.
It took a great deal of courage to admit that all his efforts had been ____.
Recently our class held a fierce _____ as to whether cameras should be installed in public areas.
As we all know, surfing _____ Internet has now become _____ popular means of getting information.
—Your hamburger is the best I’ve ever tasted, Ms. Black! —Thanks, Harry. _____.
Water, which seems so simple and common, is _____ makes life possible.