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56.discoveries。根据some可确定用复数形式。57.suitable。此处要求用形容词形式作表语。58.an。此处network为可数名词的单数形式。59.planet's。此处要求用名词的所有格形式修饰surface。60.with。此处为with复合结构。61.What。此处为what引导的主语从句。62.or。此处为whether.or搭配。63.seen。此处用动词-ed短语作定语修饰“the marks'”。64.went。根据“an early wet and warm era that ended after 1.5 billion to2.5 billion years”可确定用一般过去时。65.leaving。此处用动词-ing短语作结果状语。

2l.B。根据第二段中的“providing two hours of group instruction five days a week for players'”可确定答案。22.B。对比第三段中的“A carefully designed and integrated approach to the total tennis game since 1970.”和第四段中的“The Soccer Program is an exciting new program..”可确定答案。23.D。根据最后一段最后←句“Those who choose this program will be required to complete videoassignments before arrival..”可确定答案。