阅读短文，从文后所给A—F六个句子中选出填入文中空缺处，使短文完整正确。
If you have a brother or sister, you already know you are different from each other．You live together in the same house and have the same parents．________ Why is this? One possible reason is the way your parents treat you．
First-born children receive all the attention from their parents． Most families have twice as many photos of a first-born as any other child． Parents tend to give them more responsibility．_______ As a result, first-borns are often responsible, hard-working and serious． They often want to do well at school and work_______ For example, George W. Bush, George Washington, and Lyndon Baines Johnson are all first-borns．
When a second child arrives, parents are more relaxed． The second child is allowed to be more independent． But he also has to compete with the first-born for the parents’ attention and love． These children often choose different sports and hobbies to show independence．______ They are often adventurous, fun-loving, and outgoing, but can be jealous and get angry easily．
The youngest child tends to be the happiest． He has fewer responsibilities and more freedom． These children do not feel pressure to do well at school and work, but have to be creative to get their family’s attention．_______ So, many famous talk-show hosts and comedians were born last．

A．There are more first-born American Presidents than second or last-born children． B．They are often friendly， humorous and calm． C．But you have different personalities． D．Their parents may probably love them more． E．And they develop different personalities． F．They depend on the first-borns to take care of younger brothers and sisters．