A．It is a place full of risks.           
B．It is a good place to invest in.          
C．It has up times as well as down times.                 
D．It has more up times than down times.

A．To find out if she has the flu.        
B．To find out how to maintain a nutritious diet.         
C．To find out how to prevent illness.
D．To find out the results of a blood test.

A．She gets ill at the same time every year. 
B．She doesn't get enough exercise.        
C．She often has difficulty sleeping.
D．She's sick with influenza throughout the winter.