看图，将图的字母编号写在相应句子的括号内。
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1．It was my first time to travel by plane. I was so excited. My parents and I were at the airport. The airport was so big and busy. There were lots of people.
( )2．First, we checked in our bags at the check-in counter. The lady helped us.
( )3．After that, we went through security (通过安检) . We walked through the scanner.
( )4．Then we were on the plane. My seat number was 16A. The lady helped us find our seats.
( )5．My seat was by the window. I could see through the window. How great!
( )6．Finally, the plane took off smoothly (平稳地) . It was so exciting!
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