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1.Whatitwastobecomewasuncertain untilbetween4.5and3.8billionyearsago2.Theywereintimetoproducecarbon,…,whichweretomakeimportantis intime:及时;最终 intime(forsth./todosth.):及时;不迟 我迟早会遇见他. I’llseehim________. 她会及时回来准备晚餐. Shewillbeback__________preparedinner. 你认为我们能及时赶上火车吗?与time相关的短语: innotime attimes:fromtimetotime atatime atonetime onceuponatime4.allowedtheearthtodissolveharmfulgases… 5.Theymultipliedandfilledtheoceansand seaswithoxygen,whichencouragedthe6.Thelaideggstooandexistedontheearth… existin存在与…之中 existon靠…为生 existby靠…生存 Itwasimpossibleforthemto________suchasmallincome. Theuniverse________space..8.Manymillionsofyearslaterthefirstgreenplantsbegantoappearonland.动词 Ahen____inthecornerquietly.Afterawhilethehen____anegg.Buttheman____tohiswifethattheeggwasboughtintheshop______inthecentreofthetown.10.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace..protect…from/againststh.2.escapen.vi.vt Itisone’sturntodo….. Takeone’sturntodo…. Taketurnstodo…. byturns inturn Inone’sturn