Put the sentences (a-c) in the correct order, then fill in the blank to make a logical text.

We had a memorable day at the zoo yesterday, but things didn't go as smoothly as we thought. ______

a. When we arrived at the zoo, we found out that it was closed for cleaning.

b. It all started when my family decided to spend the day at the zoo.

c. We were so excited, but on our way there, it began to rain heavily.