____ are they—They are Maria and Jane.

often pointed out, knowledge isa two-edged weapon which can be used ______ for good or evil.

Our teacher said there would be ______ books in thenew library.

Do you __________ the idea of living a low-carbon life?—It sounds tough, but it is a tendency. [ ]

The study showed a deep fear among the old people of_____ to the care ofstrangers.