79. [A] down

　　[B] below

　　[C] beneath

　　[ D ] off

　　80. [A] studied

　　[B] researched

　　[C] surveyed

　　[D] observed

　　81. [A] plenty

　　[B] number

　　[C] deal

　　[D] supply

　　82. [A] although

　　[B] because

　　[C] so

　　[D] if中 華 考 試 網(wǎng)

　　83. [A] that

　　[B] where

　　[C] when

　　[D] as

　　84. [A] exact

　　[B] definite

　　[C] certain

　　[D] decisive

　　85.

　　[A] held

　　[B] taken

　　[C] got

　　[D] developed

　　86.

　　[A] find

　　[B] expose

　　[C] uncover

　　[D] discover