Ⅳ. Complete the following statements with proper expressions according to the textbook. (12%, 2 points for each)

30. There are two types of morphemes: free morphemes and ____________ morphemes.

31. Based on the degree of similarity, homonyms fall into three classes: perfect homonyms, homographs, and ____________.

32. The meaning of a word can be divided into ____________ meaning and lexical meaning.

33.The problem of interrelation of the various meanings of the same word can be dealt with from two different angles: diachronic approach and ____________ approach.

34. ____________ dictionaries involve two language.

35. ____________ are complete sentences which are mainly proverbs and sayings, including colloquialisms and catchphrases.

Ⅴ. Answer the following questions. (20%, 5 points for each)

36. What is a word?

37. How many periods of the English vocabulary development can be divided into? What are they?

38. What is synonym?

39. What are specialized dictionaries?

Ⅵ. Analyze and comment on the given sentence(s). Pick out the idiom in the sentence, and point out its structure, grammatical function and figure of speech. (20%)

40. I am thinking of putting a “Silence is golden” placard in his office. Nobody can hear themselves think.