It took a long time to arrive (a)  

It was a great experience (a)  

I went to a restaurant (a)  

I went to the Champs Elysées to do a bit of shopping (a)  

I then took a tour bus (a)  

I took the flight back to China (a)  

I got back on the tour bus (a)  

I started taking pictures (a)  

Once I had eaten. (a)