Units in Every Day Life (Help?)?

1-r;2-e; 3-n; 4-j; 5-d; 6-c; 7-g; 8-b; 9-t; 10-q; 11-s; 12-l; 13-a; 14-f; 15-o; 16-i; 17-p 18-h; 19-k; 20-m