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B. useful B. problem B. work out it B. much B. calls B. smaller B. as B. from B. get B. what |
C. used C. question C. work out C. too C. called C. smallest C. or C. up C. take C. that |
D. to use D. thought D. work them out D. so D. calling D. most small D. but D. of D. put D. which |