21.[A] compatible [B]parallel [C] similar [D]identical

　　22.[A]Furthermore [B] However [C] Hence [D]Otherwise

　　23.[A]addition[B]brief [C]general [D] fact

　　24.[A]provided[B]since [C]whereas [D] though

　　25.[A]stages [B] periods [C] years [D]sessions

　　26.[A]location[B]position [C]situation [D]condition

　　27.[A]patterns[B]designs [C]stations [D]schemes

　　28.[A]variation [B]balance [C]frequency [D]stability

　　29. [A] small [B] few [C]rare [D]scarce

　　30. [A]operation[B]production[C] procession[D]action

　　31. [A] spending [B]planning [C] financing [D]saving

　　32. [A] expenditures [B]benefits[C]costs [D]profits

　　33. [A]expensively [B]consistently [C] periodically [D]cheaply

　　34. [A] conveniently [B]beneficially [C] advantageously[D]favorably

　　35. [A]on account of [B]in terms of [C]regardless of [D]in spite of

　　36. [A]Like[B]Except[C]Regarding [D]With

　　37. [A] application[B]endurance[C] expectancy[D]extension

　　38. [A]concentration [B] continuity[C] conformity [D]conductivity

　　39. [A]develop [B]differ[C]depart[D]derive

　　40. [A]interchangeably[B] immediately [C] intermittently[D]intensively