In many societies of the world， we find a large number of people who speak more than one language. As a characteristic of societies， b（） inevitably results from the coming into contact of people with different cultures and different languages.

填空题Phonological rules may move phonemes from one place in the string to another. For example， Modern English verb ask was Old English askian， with the k preceding the s .Sound change as a result of sound movement is known as m（）.

填空题While the meaning of a sentence is abstract and decontextualized， that of an u（） is concrete and context-dependent.

填空题That the denial of one member of two words implies the assertion of the other is the characteristic of c（） antonyms.

填空题A c（） sentence contains two or more clauses， one of which is incorporated in the other.

填空题A r（） is often seen as part of a word， but it can never stand by itself although it bears clear， definite meaning.