What does the notice say?

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

We had an unforgettable holiday in Singapore last week. Things didn’t go on as smoothly as we had expected before. _______.

a. Upon our arrival at the safari park two hours later, we realized that it was closed for maintenance.

b. It all started when my parents decided to visit the safari park.

c. We were so excited about the trip, but the moment that we left the hotel, it started raining.

Read the following sign or notice and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

What does the sign say?