I must wear a raincoat because it is raining outside., , They must do their homework because the teacher will check it tomorrow., , They must wear a helmet because they will ride bikes., , I must make my bed before I can go play outside., , I should finish eating before you come., , I'll call you when I finish doing my homework., , Sixty minus ten makes fifty., , Twelve take away five equals seven., , The difference between 18 and 6 is Twelve., , 15 removed by 4 is eleven., , Sixty minus forty equals Twenty., , I must go to school because I am a student., .

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