a. There will be buffet and of course singing and dancing.
b. Dear Kate, I've passed the entrance exam to Hanoi University of Science.
c. I look forward to your joining our party. I'm very happy if you say "Yes".
d. On this occasion, I am celebrating a warm party at home on Saturday, September 18th at 5 p.m. Would you like to come?
e. I also invite most of our classmates to come. This is an opportunity for all of us to meet each other for such a long time.
f. Love,