1 fought 2 tried 3 am copying 4 have copied 5 was copying 6 will copy 7 copied 8 copy 9 have been copying 10 occured 11 did you learn 12 is knocking 13 have been, did you visit 14 is blowing 15 bought 16 did not buy, went 17 do not need, know 18 has not come 19 will come 20 comes