SAT填空,要解释

Soon after the first visiters arrived,increasing numbers of the residents of the remote island thought it possible that that outside world instead of being__, could be __ and worth exploring.
A.insulor...unlimited B.friendly..wicked
C.amiable...coorperative D.threatening..fascinating
E.forbidding...harmful

一道sat的填空 问一道sat填空题 英语填空~~~要解释~~~有奖励啊~~ sat填空题(请说明理由) sat 一道填空--急10分 填空并解释 语法填空解释 成语填空解释 解释词语+词语填空 词句填空.解释