选出各句相应的答语。

⑴Happy birthday, Mary.                                 A. OK.

⑵When is Mid-Autumn Day this year?          B. I eat a birthday cake.

⑶What will you do for your father?               C. I'll write him a letter.

⑷Let's watch TV together.                              D. Thank you.

⑸What do you often do on your birthday?    E. It's on September 15^th.