25. the most important thing about cotton in history is _____ part that it played in _____ industrial revolution.
a. /; / b. the; / c. the; / d. the; the
26. various summer camps being available, we can choose ______ based on our own interest.
a. either b. each c. one d. it
27. the guard at the gate insisted that everybody ________ the rules.
a. obeys b. obey c. will obey d. would obey
28. a few minutes earlier and we ___ the train.
a. have caught b. had caught
c. could have caught d. were to catch
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