The question requires filling in blanks in a sentence to ensure it makes logical sense. By analyzing the sentence, "Our Constitution is so simple and __________ that it is always possible to meet extraordinary needs by changes in emphasis and arrangement without loss of essential __________," we need words that describe a constitution that is adaptable yet retains its core essence.
Let's evaluate the options:
Among these, "practical ... form" aligns perfectly with the needs of a constitution that is adaptable while maintaining its essential structure.