Sagot :
Answer:
1. RESEARCH
- experiment,
- science,
- investigate,
- investigation,
- probe.
2. QUESTIONNAIRE
- form,
- question,
- query,
- respondent,
- personality inventory.
3. RESPONDENTS
- defendant,
- informant
- answerer,
- complainant
- claimant.
Answer:
1. RESEARCH
2. QUESTIONNAIRE
3. RESPONDENTS