Почему значение электроотрицательности большинства благородных газов равно нулю?​

Correct the mistakes in the transport words.
1 It was a long flite from Moscow to the USA but I enjoyed it. flight
2 A jurney is usually longer than a trip.
3 The London undergrond is one of the biggest in the world.
4 The hoovercraft was invented in 1956.
5 You can see for miles when you go up in a baloon.__________
6 I've never been on a yaght, but isn't it boring after the first few days?
7 My father is a lory driver.
8 The underground is full of comuters in the morning.