--------------------what's wrong---------------
vocabulary:
    deep in thought
    exhausted: completely tired
    furious:extremly angray
    impatient
    depressed
    nervous
    high strung
    disgusted
    in great pain
    nostalgic(not use commonly)
    moody:change mood quikly
    ashamed
    hyper
    out of it: it is not focus on what they are doing
------------------------------grammar focus------------------------------
 to "feel under the weather" is to feel sick or emotionally depressed.
if you are not too close to someone and they ask you what's wrong, you
could tell them you are "feel under the weather", you didn't need to go into details.

--------------culture point---------------------
Happy pills
some people say that America is a prozac Nation.
Prozac is commonly called "the happy pill",because it helps
get rid of depression.
      Every year  different brands of "happy pills" earn 5.5billion.
some people complain that  it's not rignt for doctor to give everyone happy pills.
There are problems that cannot be ignored or hidden.