Hi Judy_LIU,
if you look in the tracker: https://docs.google.com/spreadsheet/ccc?key=0Ag-ASbHOIF93dDlLNjAtR1k4eGNtZ0xhSzkzYnBrVmc&pli=1#gid=0
you will see that most of the people that applied in April have not been contacted yet.
Hang in there, we are all anxiously waiting for some contact, but...