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Across
  1. 3. a request for information
  2. 8. extremely important and necessary, fundamental
  3. 9. the activity of creating personal and business relationships with other people
  4. 10. to use and control (something)
  5. 11. acting together : to come together and have an effect on each other
Down
  1. 1. to work with another person or group in order to achieve or do something
  2. 2. good at doing something, skilful
  3. 4. to make (something) active or effective
  4. 5. a talk or speech given to a group of people to teach them about a particular subject
  5. 6. to plan and make decisions about (something that is being built or created)
  6. 7. to think of or create (something) in the mind