从方框中选择恰当的词并用适当形式填空，完成短文。

sale,   talk,   at,   wait,   help

Hey!  I’m Lucy.  Today is Sunday.  I don’t go to school.  I am shopping   1    West Mall with my parents.  I see some good sweaters at the Mall.  And they are on    2  .  The red sweater is only 40 yuan.  The yellow sweater is only 20 yuan.  My mother is    3    to the shop assistant.  Oh,  dear!  The shop assistant is my mother’s good friend.  She is Mrs Jones.  Her daughter,  Linda is    4   her mother sell sweaters.  Where is my father?  He is in front of the mall.  He is talking with a policeman and    5   for us.  Who is the policeman?  Sorry,  I don’t know.