The town was nearly empty because everyone was watching the championship on TV.
The best way to combine these sentences is to use the conjunction "because". 
Last night after the washer broke and flooded the basement, it took us an hour to clean up.
Adding the word after creates a dependent clause which then must be connected to the independent clause to create on sentence.
A little white dog, which belonged to the neighbors, was sitting on the front door.
Changing the second sentence into an adjectival clause allows the two sentences to be combined. 
Rosie wanted to go to the lake with us, but she got sick and couldn't go.
Adding a coordinating conjunction (but), allows for both of these sentences to be joined together as a compound sentence.
Istanbul, the biggest city in Turkey, used to be called Constantinople.
By changing the first sentence into an appositive phrase, it allows for the sentences to be easily combined.
 
        
             
        
        
        
Answer:
Since you write an email to a cousin , your email will be informal.
you begin with "Dear Cousin,"
then say hi and ask about his news and tell him yours. (1st paragraph)
(2nd paragraph) You say you heard that he doesn't want to eat vegetables and how you received the news. You'll explain to him in a friemdly manner the benefits of vegetables and the consequences of not eating them. (staying healthy , his body is in need of vitamins for growth,,etc)
then you end your email by suggesting him to eat a different kind of vegetables or cook them differently or whatever and that you wish he would think again and change his mind about it.
 
        
                    
             
        
        
        
The correct answer is B. Sally has a new blue bedspread.
Why not the other ones?
A. The table was delivered in two, cardboard boxes. - this sentence should not have a coma between 'two' and 'cardboard'
C. It is, an octagonal, wooden table. - we don't put a comma after verb - in this case after 'is'
D. The old, and dusty table had cracked broken legs. - there is no need to put a comma before a conjunction word (i this case - and)