A．They can make people work fast.         
B．They can help people stay healthy.     
C．They can help people organise other activities.             
D．They can make people get prepared for sports.

A．Most people had little interest in the reunion.
B．Some people got tired from the reunion activities.
C．Many graduates disliked Ms. Yates' ways of teaching.
D．Some graduates were too busy to listen to Ms. Yates' speech.

A．She kept track of her students' progress.      
B．She gave her students advice on their careers.  
C．She attended her students' college graduations.   
D．She went to her students' wedding ceremonies.