48. It is _____ of him to put everything in disorder in the room. He is so peculiar.
A) unconscious
B) aware
C) typical
D) unkind
49. John was young, _____, he was equal to this important task.
A) therefore
B) moreover
C) nevertheless
D) hence
50. Air is composed of _____ gases including hydrogen, oxygen and carbon dioxide.
A) varied
B) variant
C) variable
D) various
51. You can't let the situation get worse. You must take _____.
A) decisions
B) sides
C) directions
D) steps
52. It's difficult to _____ with the knowledge that he is a failure.
A) feed
B) live
C) stay
D) get on
53. Millions of workers were on the streets in the greatest _____ of working class solidarity this country has ever seen.
A) demonstration
B) explanation
C) presentation
D) communication