Every country has its own culture. Even though each country uses doors，doors may have   different functions and purposes ___________ lead to cultural differences.
When I first came to America，I noticed that
a public building had two different doors and ___________ had distinct functions. You have to push the door with the word “PUSH” to go out of the building and to pull the door_________ the word “PULL” to enter  the building. This was new to me, _________ we use the same door in South Korea. For quite a few times I failed _________ (go )out of a shopping centre and was embarrassed. The way of using school bus doors was also strange to me. I used to take __________ school bus to classes.
The school decided that when the driver opened both the front and back doors，students who ___________off the bus should get off first，and students who were getting on should get on later.
In South Korea, we do not need to wait for people to get _________. One morning, I hurried to the bus, and when the bus doors opened, I _____________(conscious) tried to get on the school bus through the front door. All the students around looked at me, I was totally embarrassed, and ___________ face went red.