In fact, _______ one cause that leads to the problem. 

I haven’t seen Sara since she was a little ___________

 A sense of __________ is the basic requirement for people working in the service industry,     such as education and health care.

It is a great ________ for a person to be able to drive when he is looking for a job.

Her question was so difficult that I could hardly make any ____ of it at all.