George Gould too visited the tomb, ____ a high fever the next day.

.At this moment the bell rang _______ the end of class.　

----Did the reference give the information you needed?----Yes, but            it, I had to read it entirely. 

Entering the room, I found Mary ______at the desk and _____a letter.

I still remember ______ to the south where we attempted _____ the river, which proved to be dangerous.