根据问句，选择适当的答语。(20分)
(  )（1）When is your birthday?
(  )（2）How many months are there in a year?
(  )（3）What is he doing?
(  )（4）Is there a birthday in May?

A．He's having a birthday party.	B．Yes, there is.
C．In June.	D．Twelve.