Which of the following underlined part is different from others

Sitting at the back of the room but infront of some old men and women ______ a very shy girl with two bright eyes.

Jess was sad and her friends helped her the first awful weeks after her husband Bill died.

The big secret in life is that there is no big secret. __________ your goal, you can get there if you’re willing to work.

．Researchers from MIT, Harvard reported a study of human brains yesterday that may______ some new information for mental illnesses.