Read the following text and answer the question.

It was twelve years ago on my first flight from Medan to Ujung Pandang. Early in the morning, I …. (I) with Garuda Indonesia. When I came to … (II), I did not know how to check-in. All procedures were so new for me. When the plane took off, I really felt nervous as that time. Soon, the plane landed safely. I spent two days in Ujung Pandang and I could visit many tourist destinations there. It was tiring … (III) I felt happy.

What is the best word to fill the blank in point III?