答得好+50分!1.----OH,there is someone in the room.----( ) must b

答得好+50分!
1.----OH,there is someone in the room.
----( ) must be my beother.
A.He B.This C.It
2.Linda always takes ( ) active part in sports after school.
A./ B.a C.an
3.This is my twin sister Lucy .Both she and I ( ) good at drawing
A.am B.is C.are D.be
4.My father is ( ) engineer.He works very hard.
A.a B.an C.the D./
5.-----whose notebook is it
-------It belongs to Lily.Didn't you see ( ) name on it?
A.she B.her C.hers