Помогите, нужно выбрать в каждой цифре одну букву и объяснить почему.

спасибо

удачи ^^

1. b The dictionary is not with it's owner. So that the owner can't check the word. 2.aI have mobile phone, so I can phone my parents. 3.bI don't live inondon, so I can't visit The National Library every week.