II. 綜合測驗        According to studies, millions of people are suffering from a kind of light depression,    11    the blues, and they may experience times of very low energy.    12    causes you to feel blue, you had better find a way to beat the blues and keep on going. Exercise, for example, is a good start. Physical activities cause the body to    13     endorphins, which produce a feeling of well-being. Some doctors also believe that there is a connection between food and mood. To put it simply, what you eat can affect how you feel. If you consume too much junk food, then you may end up    14        down in the dumps. Besides, while caffeine may provide an immediate boost of energy, it may also keep you from getting a good night’s sleep, making you feel    15    worse later on.
【題組】11.
(A) call
(B) calling
(C) called
(D) to call