Filling the blanks with given hints.1 Some working students ________(习惯于)spending their earnings on drugs and alcohol.2 According to our studies, alcohol and drug use, in turn, ________（或许与…有关）disengagement from school, and therefore, is likely to depress school performance.3 Working students cut corners by taking easier classes, copying assignments from other students, cutting class, or refusing to do work assigned by their teachers. Over time, as these________,（成了习以为常的做法） students’ commitment to school is eroded bit by bit.4 ________(考虑到)half of all employed seniors, about one-third of all juniors, and about one-fifth of all second-year students work above the 20-hour limit, indications are that a large number of students are at risk of compromising their school careers with their part-time jobs.