Question

he deserved to succeed. he failed.( join adverbial clause)

Answer 1

Answer:

Although he deserved to succeed, he failed.

Explanation:

An adverb clause is a dependent clause that is used to add more information about a verb, adverb, or adjective. Adverb clause answers the question ‘how?', ‘where?', and 'under what conditions?'

Though or although is a conjunction. Though is informal. It means the same as although. Meaning of 'though' is 'despite the fact that'.  

Example  

Though she did not recognize, I was sure she had met me somewhere.