Although interior design has existed since the beginning of architecture, its development【

Although interior design has existed since the beginning of architecture, its development 【21】______ a specialized field is really quite recent. Interior designers have become 【22】______ partly because of the many functions that might be 【23】______ in a single large building. There might be stores, theatres, restaurants, and other 【24】______ on the main floor or lower floors of building, while the upper floors might have hotel rooms, apartments, or business offices for many 【25】______ kinds of companies.

The importance of interior design becomes 【26】______ when we realize how much time we spend in places surrounded by four walls. Whether we need to be 【27】______ , we want our surroundings to be as attractive and comfortable as possible. We also expect each place to be appropriate 【28】______ its use. You would be shocked if the 【29】______ of your bedroom was suddenly changed to look like that 【30】______ a restaurant. And you 【31】______ feel right in a business office that looked like a school.

It soon becomes clear that the interior designer' s most important basic 【32】______ is the function of the particular space. For example, a theatre with poor sight lines, poor sound-shaping qualities, and too few 【33】______ and exits will not work for its 【34】______ , 【35】______ how 【36】______ it might be decorated. 【37】______ , for any kind of space, the designer needs to make various kinds of decisions. He or she must 【38】______ decoration of everything from the shape, textures, lighting, and 【39】______ to floor. 【40】______ addition, the designer must usually select furniture or design built-in furniture, according to the functions that need to be served.

【21】

A．into

B．with

C．on

D．as