What does Lexicology, a brunch of linguistics study?

What is the smallest meaningful unit of speech?

1. 
   The smallest meaningfill unit of speech is a stem.
   
2. 
   The smallest meaningful unit of speech is a word.
   
3. 
   Hie smallest meaningfill unit of speech is a sound.
   
4. 
   The smallest meaningful unit of speech is a morpheme.
   
5. 
   The smallest meaningfill unit of speech is a root.
   

6. 
   Which words do we call homonyms?
   

1. 
   Homonyms are words winch are identical in writing.
   
2. 
   Homonyms are the words which are identical in pronunciation.
   
3. 
   Homonyms are the words which are identical in speaking.
   
4. 
   Homonyms are the words which are identical in sound and spelling.
   
5. 
   Homonyms are the words which are identical in their meaning.
   

7. 
   What is the leading semantic component in the semantic str ucture of the word?
   

1. 
   Hie leading component is termed connotative component.
   
2. 
   The leading component is called componential analysis.
   
3. 
   The leading component in the word is termed transformational component.
   
4. 
   The leading component is termed denotative component.
   
5. 
   The leading component is called simple component.
   

8. 
   What is the main way of enriching and enlarging the English vocabulary?
   

1. 
   The mam way of enriching the English vocabulary is word-building.
   
2. 
   The mam way of enriching the English vocabulary is affixation.
   
3. 
   The mam way of enriching the English vocabulary is conversion.
   
4. 
   The mam way of enriching the English vocabulary is composition.
   
5. 
   The mam way of enriching enlarging the English vocabulary is contraction.
   

9.