X Sugar is one of the most important plant products.  The word sugar applies to more than 100 distinctive substances, each with a scientific name.  The sugar most commonly obtained from X plants is X sucrose.  When it has been refined, X sugar is colorless and odorless.  However, X sugar obtained from the sap of the maple tree tastes different from the sugar derived from the juice of the sugar beet.  X Impurities account for the difference in the taste of the two forms of X sugar.  X Sugar is produced in X Europe, X Asia, X Africa, X Australia, and X America.  The sugar which comes from X Cuba is largely X cane sugar.  The sugar from the most western part of the United States is largely X beet sugar.

        X Water is a necessity for sustaining X life in X plants and animals.  X Men have always been interested in the nature of X water.  At one time, X water was considered to be an element.  Most water is derived from the ocean directly or indirectly.  The water which X New Yorkers use does not come from the Hudson River.  The water used in X New York homes comes from X large reservoirs.  The water in these reservoirs is purified.  However, X absolutely pure water is probably unknown.  X Lake water is relatively pure, especially in X mountainous regions.  X Most people think X spring water is pure.  However, the water which comes from X springs sometimes contains X large amounts of two types of X salt.  Therefore, the water in your springs should be analyzed.

            X Dust is a great inconvenience to X housewives.  It is a difficult problem.  X Dust causes a housewife X hours and X hours of X housework a week.  To make X things worse, X dust always seems to settle in the most inconceivable places.  The dust which comes from X chimneys seems to spread everywhere.  X Coal dust is one of the worst types of X dust to wipe up.  In the neighborhood where we live, the dust from the Ajax Factory in the next block causes us X trouble.  The edges of our windows are covered with X dust in less than a day.  The dust on the surface of the tables in our apartment is not quite so difficult to remove.  I know the characteristics of X dust very well because my wife frequently asks me to wipe up the dust on the desks and X bookcases in our apartment.

Source:  Taylor, Grant (1956).  Mastering American English. New York: McGraw-Hill.