86. close, closely  

close 接近,靠近,例:stand close
closely 紧紧地,紧密地,例:closely connected

87. ill, sick  

ill 做表语;
sick 定语、表语均可,例:a sick boy

88. good, well  

good 形容词;
well 副词,但指身体状况是形容词,例:He is well again.

89. quiet, silent, still  

quiet 安静的,可以发出小的声音;
silent 不发出声音,但可以动;
still 完全不动,完全无声响,例:He stand there still. 他站在那儿,一动不动,也不说话。

90. hard, hardly  

hard 努力,例:work hard
hardly 几乎不,例:I can hardly believe it.