The subordinate clause in this sentence is because I forgot to buy milk. The whole sentence is used as an adverb. Adverbs are used to answer questions such as where, when, or in this case, why. 
Why did I have root beer in my cereal? Because I forgot to buy milk. 
        
                    
             
        
        
        
Answer:
distribute or provide (a service or information) to a number of people.
Explanation:
 
        
                    
             
        
        
        
Explanation:
If students wear regular clothes to school they have more freedom to express themselves. Regular clothes can be bought on sale or for discounts. Uniforms are expensive, so wearing regular clothes to school will take an extra weight off of parents
like this I would tell 
 
        
             
        
        
        
I’m pretty sure it would be the second option(:
        
             
        
        
        
Answer:
Driving a car is an important responsibility because you would have to drive safety, obey traffic laws, and respect other drivers while on the road. 
Explanation:
What I did here was include your topic and simply provide three supporting reasons directly after. A thesis is a statement that explains what will later be seen in the essay.