2. Unlike crowded jets, the Aircruise will allow passengers to travel in

(a)  

3.The Aircruise can travel at low altitudes if there is something

(a)  

4. Hydrogen fuels the airship and also provides (a)   for the people on board.

5. The Hindenburg airship disaster killed (a)   people.

6. Scientists are keen to develop transport options which are both (a)   and environmentally friendly.

7. The Aircruise will carry a total of (a)   passengers.

8. The luxury features on board include private apartments, a bar and a (a)  

9. Compared to airports, the Aircruise has the potential to land closer to (a)  

10. The concept is getting a lot of attention from a Korean company which makes (a)