What does Lexicology, a brunch of linguistics study?

By borrowing (or loan-word) we mean a word which came ...

1. 
   *into the vocabulary of one language from another language.
   
2. 
   into the vocabulary of many languages from one language.
   
3. 
   into the stock of words of different languages from any foreign language.
   
4. 
   into the vocabulary of one language from 2 or 3 other languages.
   
5. 
   into the vocabulary without any changes.
   

13. 
    The conversion, derivation and composition are....
    

1. 
   *the productive ways of word-building.
   
2. 
   the productive ways of producing new words.
   
3. 
   the productive ways of forming new meanings.
   
4. 
   the productive ways of developing the language.
   
5. 
   the productive ways of forming the vocabulary.
   

14. 
    All morphemes are subdivided into two large classes:.... and ....
    

1. 
   stems and roots.
   
2. 
   roots and suffixes.
   
3. 
   suffixes and affixes.
   
4. 
   * roots and affixes.
   
5. 
   prefixes and affixes.
   

15. 
    The process of affixation consists in coining a new word by....
    

1. 
   deriving words from different languages to some root morpheme.
   
2. 
   adding a suffix to some root.
   
3. 
   adding a stem to some root.
   
4. 
   * adding an affix to some root.
   
5. 
   adding some endings to some root.
   

16.