21-25 ADACD 26-30 BABAC 31-35 BCBAC 36-40 GFCBE 41-45 BADCA 46-50 CBDBA 51-55 DCBCD 56-60 CADAB

61-70(One possible version)

61.similarity 62.a 63.regularly 64.measuring65.for /at 66.taken67.passers-by68.reasonable 69.whose 70.will be attracted

短文改错(One possible version)Since my home is far from my school and I have to go to school by the bus,I am always late forschool.Last month my father bought a bike to me.I persuaded my best friend Tom,that enjoysforwhothe benefits of riding a bike,∧teach me how to ride a bike.He runs with me all the time so that Itoranmight not hurt me.With his help,I picked up the things rapid and could ride soon.I now go tomyselfrapidlyschool on my bike,regarded riding a bike as the best ways of transport.Of course,I never ride fastregardingwayin the crowd streets.What a pleasure it is to fly like a bird on my bike!crowded