Điền từ thích hợp vào chỗ chấm: I'm writing to invite you to a party we ......at the flat the flat next Friday

Dear Hanh,
I'm writing to invite you to a party we ......at the flat the flat next Friday, December 14th.As you know ,.....Lan's 13th bitthday next week and my bithday next month,..... we thought we'd celebrate together and have a joint part