In the following passage, some of the words have been left out. First read the passage over and try to understand what it is about. Then fill in the blanks with the help of the alternatives given.

Broadly speaking letters may be said to 41 into two classes, the formal and 42. Formal letters 43 of official or business matters and are 44 to an employer, officials of a department or institutions. Letters to the 45 of a newspaper also belong to this class. In fact, all 46 using formal pattern is of this category. The 47 has to be precisely stated. It must be 48 in style and quite 49. No 50 element has any place in it.