A．Wearing arm weighs while you are swimming. 
B．Jogging vigorously in one place for a long time. 
C．Using bicycles that require you to use both your arms and legs. 
D．Walking slowly while swinging your arms back and forth. 

A．He doesn't want to take final exams. 
B．He hasn't prepared well for his tests. 
C．He has too many exams on the same day. 
D．He needs to get full scores on his tests. 

A．He should go to the Dean of Students Office. 
B．He ought to talk immediately to his professors. 
C．He should begin studying at once. 
D．He ought to decide which tests are most important.