Ⅳ.Complete the following statements with proper expressions according to the textbook. (10%, 2 points for each)

36. Middle English lasted for more than three hundred years ：_____.

37. The four major foreign contributors to English vocabulary in earlier times are Latin, French, Scandinavian and _____.

38. The relationship between sound and _____ is arbitrary and conventional.

39. Concept is the _____ of human cognition, and it reflects the objective world in the human mind.

40. A word whose meaning was borrowed from another language is called semantic _____.

Ⅴ.Study the following words and decide how each word is formed. (10%, 2 points for each)

Example: disobey                                       (Affixation)

41. G-man                                                （        ）

42. flu                                                     （        ）

43. sci-fi                                                  （        ）

44. pocket (v)                                          （        ）

45.daydreaming                                        （        ）

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

46. What is sense?

47. How do you understand the statement that “true synonymy is non-existent”?

48. What are the types of changes in word meaning?

49. What are the similarity and the difference between a verb phrase and a phrasal verb?

Ⅶ. 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. (15%)

50. She said that his hair was pepper and salt.