Choose the correct word to complete the passage

I began my teaching career nearly ten years old. I spent six years teaching in a remote village (1) ______ the villagers were very poor and the living standard was low. Sometimes, I was very disappointed (2) ______ bad living condition and low pay. I am really homesick. However, at that time, with my youth enthusiasm, I tried my best to devote myself to the noblest career, that (3) ______ “teaching”. I love my poor little students. They were living in poverty but they could not (4) ______ from empty mind.

(1) ___________

• A. 
  there
• B. 
  where
• C. 
  which
• D. 
  when