15.----- that they had made an important discovery in scienc

15._____ that they had made an important discovery in science.
A.Little they realized B.They had realized little
C.Little did they realize D.Little had they realized
18.____ have I seen a better performance.
A.Everywhere B.Nowhere else
C.Everywhere else D.Nowhere
21._____the plane.
A.Flew down B.Down flew
C.Down was flying D.Down fly
23.______ I had time,I would have run round that lake again.
A.If B.Unless C.Had D.When
25.______ I would see you here.
A.Little I dreamed B.Little do I dream
C.I dreamed little D.Little did I dream
26.There ____ .
A.come they B.they come
C.they are come D.they will come
1.c 2.d 3.b.4.c 5.d 6.b