A：Hi，Anna!You look happy today．Do you have any good news？
B：Yes．I'm going to have a （16） ______ tomorrow．
A：What party？
B：Oh，it's my birthday party．（17） ______ you know？
A：No，I don't．
B：Sorry，I （18） ______ to tell you．Would you like to come to my party？
A：Sure，（19） ______ love to．But what's tomorrow？
B：It's Friday the 18th．
A：18th？Oh，I'm very （20） ______ ．I have to go to the piano lesson．（21） ______ for your invitation．I hope you have a good time tomorrow．
B：That's too bad．