Fill in the gaps with the correct derivatives

1. We must ... that tourism develops in harmony with the environment.
2. He spent an ... afternoon at the festival. 3. The ... of the case have not been revealed. 4. In the discussion that followed, several speakers noted the ... and complexity of urban crime. 5. The similarity between the two portraits of the goddess is ... . 6. Civil rights include freedom ... , in law and in employment, and the right to vote.