Answer:
I've already answered this question once, you can just look it up instead of wasting your points. :)
A dependent clause is a clause that requires a beginning or an ending to finish it off. The dependent clause in this would be "before he returns to work," as it does not work as a sentence on its own.
Step-by-step explanation:
The independent clause would be "Allen wants to visit his friends," as this could be an independent sentence on its own.