13. Have you ever visited an
airport? It is often been –
been
14. a very exciting place. If you are near an airport just go inside. – NO
15. You do not have there to be a passenger to do this. –
there
16. An airport it is usually full of people. Some of them –
it
17. will soon become are passengers. Some have just arrived –
are
18. by plane and they are now waiting for some transport to take – NO
19. them home. Others are meeting their friends or family members. – NO
20. Above in the airport some planes may be circling –
in
21. in the air. They are waiting for their turn to land. And if you – NO
22. have look around the airport you will see the control tower –
have
23. where the men who control the whole process work. – NO
24. If they make a mistake people may to get hurt. -
to