67 c for

　　68 d till


　　69 a ensure


　　70 a through


　　71 d repeats


　　72 b affect


　　73 d even


　　74 a means


　　75 c records


　　76 b produced


　　77 c with


　　78 d same


　　79 d purposes


　　80 b program


　　81 c which


　　82 a then


　　83 c concept


　　84 b after


　　85 d as


　　86 a what


　　87 Hvaing spent some time in the city, he had no trouble (in finding the way to the Museum of History)


　　88 (In order to earn enough money to afford my education), mother often takes on more work than is good for her.


　　89 The professor required that ( we hand in the research reports) by Wednesday.


　　90 The more you explain, (the more confused I get).


　　91 Though a skilled worker, (he was fired by the company) last week because of the economic crisis.