The transition which could replace the word thus in this sentence is definitely consequently.
Workers bravely set dangerous explosives in the mountains by hand to make passes for railroads, and consequently hundreds lost their lives.
Early Iron Man, like a prototype before Tony Stark’s
Explanation:
The sentence should be "The cake smells sweet." or "The cake is smelling sweet." The sentence is missing punctuation and capitalizing the beginning letter in the sentence. I would also prefer the first sentence as it has more consistency.
20 heat
21 sound
22 form
23 book
24 geo