Johnsonwas________unknownbeforerunningforthepresidency.
D
A 显然，明显地 B 外表上，直观地 C 垂直地，直立地 D 实际上，事实上
Youngerchildrenarecurious________howthingswork，andmanyofthemwanttotakeaparteverythingwithintheirreach.
Thesetwoalarmclocksarenormallysettogether,butnowtheyhavebeenresetafewhours_________.
Lying under the skull, the human brain contains an average of ten billion nerve cells called ______.
Modern English words man, woman, child, eat, fight, etc, originate from ______.
I was writing a report last night; ________ I would not have stayed up late.