"also it was undoubtedly hot in the tunnel. wisps of vapor floated up and past [bilbo] and he began to sweat. a sound, too, began to throb in his ears, a sort of bubbling like the noise of a large pot galloping on the fire mixed with a rumble as of a gigantic tom-cat purring."

tense and uncomfortable

Explanation:

I am sorry that I am two years late.

just to , the answer is b on edge

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.