Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

            Just imagine a day without paper, reads one advertisement for a Finnish paper company. It adds, 'You almost certainly see our products every day.' And they're right. But in most industrial countries, people are so (21)__________to paper - whether it's for holding their groceries, for drying their hands or for PROVIDING them with the daily news - that its (22)________ in their daily lives passes largely unnoticed.

At one time paper was in short supply and was used mainly for important documents, but more recently, growing economies and new technologies have (23)__________ a dramatic increase in the amount of paper used. However, the costs (24)__________ in paper production, in terms of the world's land, water and air resources, are high. This (25)__________ some important questions. How much paper do we really need and how much is wasted?

A. conscious

B. acquainted

C. familiar