阅读理解。
Welcome to My Birthday Party
Helen: Hi, everyone. Welcome to my birthday party.
Tom: Happy birthday!
Peter: Enjoy yourself today, Helen.
Helen: Thanks a lot. It’s my pleasure for you to join in my party.
Tom: Here’s a present for you. Do you like it?
Helen: Of course, you’re very kind.
Peter: Here you are, Helen.
Helen: Oh! How beautiful the birthday card is! Thank you very much. Now, come into the dining room,
please. I’m going to cut the cake.
阅读上面的情景，完成下列填空。
1. Helen having a_______ .
2. and are at Helen’s party_______.
3. Peter gives a to Helen_______.
4. The party is having at_______ .
结构的药物是（）