Imagine that you arrive at the airport for departure. Put the following sentences in correct order （fill in the correct arabic numbers） so that they describe the procedures you go through. 
1.Tell the man that you have baggage to check in.[填空1]
2. Go to the desk of the airline concerned in the terminal building.[填空2]
3. The man at he counter checks both your ticket and your ID card or passport. [填空3]
4. Pass into the restricted area to go through the security check point.[填空4]
5. He weighs your suitcase and places it on the conveyor belt.[填空5]
6. Board the airplane. [填空6]
7. Get your boarding pass on which your seat number is printed. [填空7]