Answer:
"Attempts were made by small blimps to attach themselves to the ... mast." = Some airships tried to fasten themselves to the post.
"It was hoped the top of the building could act as a mooring mast. = They thought blimps could be tied to a post at the structure's highest point
"Dirigibles... were thought to be a future means of international travel. = People thought that blimps would one day be a means of transportation.
Step-by-step explanation:
I just did this question on the ELA instruction on Edge and got it right!!!!