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按照课文填出句中缺少的词汇，每空填一词。

1.This bacteria-killing medicine is _____ by many to be one of the most important medicines in _____

   society… He noted that mould had ______ on a special _____ jelly that had bacteria on it.

2.Young people from different ______ and different countries can form lifelong friendships. _____, people

   who are disabled and must stay in their homes can communicate with the outside world and meet others

   with _____ interests.

3.Some experts say that spending too much time building Internet _____ can _____ people's abilities to

   live normal lives…