What shocked the world was the fact _____challenger crashed just minutes after take-off. [ ]

upset yesterday just because youdidn’t hand in your homework on time．—Terribly sorry．Ten more minutes, I ______ itto you．

____atmy classmates’ faces, I read the same excitement in their eyes

____ this may sound like a simple process, great care is needed

The professor gives every one of us the impression________he is a real expert in this field.