What have you to do before you get to the departure gate? You have to pay ___

Traveling by plane is exciting, but it can also be very tiring. There are so many things to be done. You have to pay the airport tax, check in your bags and then get to the departure gate. So it’s best to arrive at the airport at least two hours before your plane is scheduled to take off.
   When you check in, the attendant will ask you to show her your passport, ticket and airport-tax receipt. After you have done that, she will weigh your luggage. If it’s overweight, you’ll have to pay an extra fee. Then she will give you your boarding pass. On your way to the gate, don’t pass up the chance to buy something at the duty-free shop. Things are a lot cheaper there. The key point is to give yourself plenty of time and everything should nm as smooth as clock work.
Question 11: What have you got to do before you get to the departure gate?