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20 .a. jogged b. cooked c. gained d. smiled
21 .a. learn b. nearly c. ear d. clear
22 .a. willing b. diameter c. tradition d. addition
23 .a. take b. radius c. spark d. cake
24 .a. subtract b. traffic ... cinema
25 .a. added b. subtracted c. omitted d. stopped
26 .a. calculus b. unit c. use d. computer
27 .a. printed b. decided c. completed d. played
28 .a. case b. rate c. average d....