Answer:
• Singular nouns: Was
• Plural nouns: Were
*It is a scenario so most are past tenses*
1st Paragraph:-
1. were used
2. was organised
3. were brought
4. was held
5. were shown
6. was given
2nd Paragraph:
1. was organised
2. were sent
3. were made
4. were notified
5. were cordoned
6. were put
7. were mailed
8. were adviced