根据问句选答句，将其序号填入题前括号内。(10分)
(  )（1）What's the time?
(  )（2）What's your number?
(  )（3）What's your mother?
(  )（4）What's eight and nine?
(  )（5）What class is he in?

A．I'm number five.	B．It's seventeen.
C．It's seven o'clock.	D．She's a doctor.

E．He is in Class Four，Grade Five.