A couple prepositions need to be checked

Hi. I did a self-quiz on the prepositions. Please help me checking the right answers. Thank you very much.
Notice that I put my answer next to each question in ()

1. Mariel and I decided to spend a day together ____ the city. (A)
A. in
B. at

5. We enjoyed the morning browsing through the shops ____ Farrell Street. (B)
A. in
B. on

13. Caleb got up very early that morning, and they arrived ____ a great viewing spot on Smithtown Road at 7:15 a.m. (B)
A. in
B. at

14. Marching ____ the front of the parade was the Smithtown High School Band. (A)
A. at
B. by

15. Proudly blaring out the melody ____ her trumpet was Caleb's sister Alexie. (B)
A. at
B. on

16. Following the band came an antique car, and sitting ____ the front seat was Mary Abelson, the parade's grand marshal. (B)
A. at
B. in

18. Caleb was excited ____ the float, feeling like he had made an important contribution to the parade. (B)

A. by
B. at

19. Volunteers came by with shopping carts, and Caleb put some cans of food ____ one of the carts; the donated food would go to the community food bank. (A)
A. in
B. on

20. The clowns came last ____ the parade, and one of them put a huge hat made of balloons on Caleb's head. (B)
A. at
B. in