Across

1. NHS treble voice ensemble (5)

2. with 16 across, fastener (3)

5. Natick High School’s street (4)

8. most electronegative element (8)

10. short after-school sleep (3)

11. Massachusetts state bird (9)

12. T stop on Boston Common (8)

14. local wildlife sanctuary (9)

16. with 2 across, fastener (4)

17. “the blood of angry men” (3)

18. 47-stringed instrument (4)

Down

1. small fish likely to be found in Dug Pond (6)

3. Shakespeare’s “before” (3)

4. famous ancient Roman orator (6)

6. changing of the seasons in Mar. and Sept. (7)

7. AP Chem teacher (7)

9. gap in manuscript or book (6)

13. Cochituate Rail ____ (5)

14. NHS Technical Director (7)

15. polyhedral gaming tools (4)