he usually _____ ____(做完)his homework before nine o'clock 填什么

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• Rick usually gets up at around six twenty in the morning.He does his homework at seven o’clock,and then he eats breakfast at home.He goes to school at eight thirty.School starts at nine o’clock.He eats lunch at school.He usually goes home at four thirty in the afternoon.He takes a shower at five ten.He eats dinner with his father and mother at around six o’clock in the evening,then he does his homework.At around nine forty,he goes to bed.根据短文选择最佳答案.(
• He didn't do his homework until nine o'clock.直到九点,他才不再做作业.为什么不是 直到9点,他都没做作业Until recently,scientists believed that life on other planet was just a hopeful dream.是直到最近之前，科学家们都相信其他星球有生命仅仅是个充满希望的梦。为什么不是，直到最近，科学家们才相信其他星球有生命是个梦
• he usually _____ ____(做完)his homework before nine o'clock 填什么
• he usually _____ ____(做完)his homework before nine o'clock 填什么
• 用所给单词适当填空 1.She _____（not go）swimming this week用所给单词适当填空1.She _____（not go）swimming this weekend.2.He usually _____(finish)his homework before nine o'clock.
• knock over knock down
• 神舟号飞船升空后,先运行在近地点高度为200千米,远地点高度为350千米的椭圆轨道上,实施变轨后做匀速圆周运动,共运行了n周,开始时刻为t1,结束时刻为t2,运行速度为v,半径为r,则周期为( )