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Ex 11 ride 2 fly 3 driven 4cycledEx 21 source 2desert 3highlight 4clear 5true Ex 3a) 1-c 2-a 3d 4f 5 b 6eb)1 Cruise 2 bus Ex 41 taken 2 made 3 swum 4done 5riden 6seen 7 climb 8 tryEx 51 visited 2 left 3 stayed 4 traveled 5 promised 6 decided 7 choosed 8been 9. broughtEx 61 has gone 2 has been 3 has gone 4 has been 5 has been 6 has gone