31. Buy _________ friendly products whenever possible. (ENVIRONMENT)
32. You can find the most amazing _________ in rain forests. (CREATE)
33. They say that a mentally _________ job may keep your brain sharp for longer. (CHALLENGE)
34. I’m not an expert. I’m only a _________ (BEGIN)
35. I’m writing in _________ to your advertisement for a guitar teacher. (REFER)
environmental
creation
challenging
beginner
reference