Researchers have tried to identify the cause of SARS one way or (), there is, however, a long way to go.

A. the cost of a degree in medicine is very high
B. higher education investment in medicine is not worthwhile
C. a student without family medical tradition is less likely to choose medicine
D. medicine is a field where every degree-holder can get a job

A. Honest
B. Honestly
C. Honesty
D. More honest