询问生日：When is your birthday? — 英语阅读题

Read the short passage and answer the question. Hello! My name is Ben. My birthday is in the month after June. My sister Mary's birthday is in the month before May. We are very happy on our birthdays. On my birthday, Mum makes a big cake and Dad gives me a gift. Mary is only nine, but she knows all our birthdays. Today I ask Mary, "When is my birthday?" She says, "Your birthday is in July!" She is right. I love my birthday. Question: When is Mary's birthday? (You can answer in English or Chinese.)