My first guess would be that it is an independent clause. This is just a single statement.
Answer: do your best
Explanation:
Use the words that makes sense for each sentence.
Answer:
1) Don’t join the team unless you are willing to work hard, run hard, and play hard.
4) I won’t go home until I’ve finished all my work.
5) Julio finished the box of crackers; therefore, there was nothing left for his brother.
6) No one is at the midwinter dance because everyone went to a concert.
One great example of suspense in the Hobbit is when Bilbo is in Smaug's smoky, gold encrusted lair, trying to find the sparkling cup, without awakening the dragon. A few times, we see the dragon release a puff of smoke, or stir, and Bilbo stops abruptly, than tiptoes forward quietly. There is so much suspense here while we await his fate!!