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…