In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.
Twenty five years ago, while travelling and teaching in Turkey, Nepal and Iran, Bonnie Bergin noticed self-sufficient disabled people (1) ______ about their daily business, often using donkeys (2) ______ pots, pans and other wares to be sold. (3) ______ later returned to the United States (4) ______ work on a master's degree in special education. "I (5) ______ hard about what could be done to get such (6) ______ out of institutions and onto the streets, getting jobs, (7) ______ it came to me: dogs," says Bergin, (8) ______ today is the originator of the service-dog (9) ______. She ran into fierce resistance (10) ______ academics and professionals at first who said ‘Dogs spread disease’.
Select the most appropriate option to fill in the blank no. 4