What kind of travel is truly compulsory? (Para. 4) Only ____________ travel, about 30% of trips over 50 miles, is truly compulsory.
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举一反三
【简答题】You shouldn't have the machines _____all the while; you ought to have them _____now and then. [ ] A run; repair B. running; repairing C. run; repaired D. running; repaired