Mechanisms of Linguistic Change

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Question 1 - 4

Choose NO MORE THAN THREE WORDS from the passage for each answer.
The pronunciation of living language undergoes changes throughout thousands of years. Large-scale regular changes are usually called 1. . There are three reasons for these changes.
Firstly, the influence of one language on another; when one person imitates another pronunciation (the most prestige’s), the imitation always partly involves factor of 2. .
Secondly, the imitation of children from adults' language sometimes is 3. , and may also contribute to this change if there are insignificant deviations, though later they may be corrected.
Finally, for those random variations in pronunciation, the deeper evidence lies in the 4.  or minimization of effort.