i went to germany with my family ... (1) a school holiday a few years ago. it was getting dark, so we were looking for a hotel. Then we ... (2) upon two hotels

i went to germany with my family ... (1) a school holiday a few years ago. it was getting dark, so we were looking for a hotel. Then we ... (2) upon two hotels next each other with ... (3) opening, we just randomly chose one and settled for the night.
1) a. for
b. since
c. during
2) a. come
b. came
c. comes
d. coming
3) a. park
b. store
c. job
d. room