The key answer of exercise 3

Dialogue 1

1. two standard-class tickets from Melbourne to Adelaide
2. Train delays are expected.

Dialogue 2

1. directions to the National Railway Museum
2. The museum is closed.

Dialogue 3

1. directors to a post office
2. It closed at five o'clock.

Dialogue 4

1. the bus to Werribee Park
2. It's the wrong bus and you need to buy a ticket in advance.

Dialogue 5

1. two student tickets
2. She's forgotten her student card and has to pay the full price.