一、单选。()1.Asastudent,youmustbecareful________yourhomework.A.ofB.toC.with()2.Childrenshouldtalktheirparents.A.toB.ofC.about()3.Look!Somanypeoplearegetting_______thebus.A.upB.onC.of()4.CanIuse_______book?isn’there.A.your;mineB.your;myC.you;mine()5.Atthemoment,mylittlesister______homework.Sheoftenhomeworkathome.A.does;isdoingB.isdoing;doC.isdoing;does()6.--Whatareyoudoing?--I’mmymobilephone,...