Task 1 of 6
1. [ 1 ] In fact, they were largely unknown to the outside world until the 1930s, when commercial airlines finally began flying over the desolate region.
Task 2 of 6
2. Which sentence fits gap 2?
Task 3 of 6
3. Which sentence fits gap 3?
Task 4 of 6
4. Which sentence fits gap 4?
Task 5 of 6
5. Which sentence fits gap 5?
Task 6 of 6
6. Which sentence fits gap 6?