1.Under the tree ---of eight years old

1.Under the tree ___of eight years old
A.sat a little girl
B.did a little girl sit
C.a little girl was sitting
D.a little girl sat
2.Not for a moment____what he said
A.I believed
B.did I believe
C.I would believe
D.I believe
3.Seldom___ I take a bus to school
A.do B.does C.did D.done