阅读短文，回答问题。
I have four pairs of socks．They are all beautiful．I like them very much．
On Mondays，I wear the red socks．On Tuesdays，I wear the blue ones．On Wednesdays，I wear the yellow ones．And on Thursdays，I wear the orange ones．When I get home，I usually take off my socks and throw them into the bathroom．I never clean them till the weekend．So，on Fridays，I must choose a pair of socks from the dirty ones．
One Friday morning．it was 7 o'clock when I woke up．I would be late for school．I picked up a pair of dirty socks and put them on quickly．Then I ran to school．
At school，some classmates looked at my feet and laughed．At that time，I saw my socks．“Oh，no--!” I shouted．They were different．One was red and the other was orange．Now I knew why they laughed at me．But suddenly，I got a good idea to my classmates，“Don't laugh at me! They are fashionable（时髦的）socks．I like them very much!” Then we all laughed together．
Now，I know I must do everything carefully and wash my socks every day!
（1）How many pairs of socks does the girl have?
（2）What colors are they?
（3）When does the girl wash her socks?
（4）Why did her classmates laugh at her?
（5）What does she know after that?