1.【答案】exploring

【解析】people are exploring  online romances 人们正在探索网络恋情。进行时be doing. be后面的动词有两种1.进行时be doing 2.被动be +过去分词。这里不是被动。故答案为exploring

2.【答案】well

【解析】these online relationships could very well be the next logical step for humanity. 这些网络关系很可能是人类下一个合乎逻辑的步骤。very后面一般接形容词和副词。故答案为well

3.【答案】logical

【解析】the next logical  step 下一个合乎逻辑的步骤。修饰名词step用形容词。故答案为logical

4.【答案】opportunity

【解析】People have the opportunity to know… 人们有机会了解…。the后面接名词。故答案为opportunity

5.【答案】manner

【解析】all manner of folk 各种各样的人。词组all manner of各种各样的。故答案为manner

6.【答案】meet

【解析】they would never meet in their day-to-day life 他们在日常生活中永远不会遇到。would后面接动词原形。故答案为meet

7.【答案】cultural、economical、national

【解析】cross cultural, economical, national, … 跨越文化、经济、国家…的界限。这里是几个形容词的并列，cultural, economical, national 。故答案为cultural、economical、national。

8.【答案】real

【解析】 in the real world. 在现实世界。修饰名词world用形容词。故答案为real

9.【答案】However

【解析】However, when you are talking to people online… 然而，当你在网上和人们交流的时候。修饰句子用副词。故答案为However

10.【答案】way

【解析】you have no way of telling what the person you are talking to is like. 你没法知道和你说话的人是什么样的人。no后面一般接名词。故答案为way

11.【答案】telling

【解析】 you have no way of telling  what the person you are talking to is like. 你没法知道和你说话的人是什么样的人。介词of后面接名词，如果是动词，需用ing。故答案为telling

12.【答案】ability

【解析】Without the ability to see someone, 不能看见某个人。the后面接名词。故答案为ability

13.【答案】properly

【解析】you cannot properly  judge them, 你不能正确的判断他们。修饰动词judge用副词。故答案为properly

14.【答案】sort

【解析】what sort of person 哪种人。what kind of person也是同样意思。故答案为sort

15.【答案】make

【解析】you make the dangerous step 你迈出危险的一步。代词（具有名词性质）和后面的名词短语之间，要么用连词，要么用动词使之具有逻辑联系。一般很少考连词，大多考动词。词组make a step迈步, make the first step迈出第一步。故答案为make

16.【答案】dangerous

【解析】 you make the dangerous  step 你迈出危险的一步。修饰名词step用形容词。故答案为dangerous

17.【答案】meeting

【解析】 make the dangerous step of meeting  them in real life. 迈出危险的那一步去与他们在现实生活中见面。介词of后面接名词，如果是动词需用ing形式。故答案为meeting