1. Wow! I was not expecting this much.
2. Uh. i will prefer tea.
3. He lives in a small house even though he is a millionaire.
4.Though it was raining , she went out.
In the first and second sentences, interjections are used. "Wow" to express surprise and "Uh" is used to pause.
In the second and third sentences, Subordinating conjunctions are used. Third sentence is Independent clause + SC+ dependent clause. fourth sentence is SC+ dependent clause + independent clause.