Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.

—How often does your sister surf the internet?—About            .

. The education system was once the ______of the country, but now it seems to be________.

It was a long time before the Americans completely _________ from the shadow of the September 11th attack launched by the terrorists.

 Our English teacher often tells us that the meaning of a new word may be   ________    according to the given context.