1. Употребите глагол-сказуемое в правильной форме

It is known that an alcoholic's life 6_____ (to shorten) on the average by ten twelve years. Alcohol 7_____ (to cause) heart disease and finally brain damage. When the effect of a drink 7_____ (to be) over an alcoholic 8_____ (to get) nervous and aggressive until he 9_____ (to drink) again. He often 10_____ (to fail) to recognize the problem: "I can 11_____ (to stop) any time I want to," is the typical reaction. By the time he 12_____ (to realize) he has got a drinking problem he 13______already _____ (to reach) the point of no return.