_______ did you spend _______ painting? [ ]

With 4G mobile phones, people can even see each other as they talk. —-Really? Would you show me it, please?

His home is _____ his school. So he walks to school.

With the help of the smart phones, you ____ video chat with your friends on the phone.

Would you mind _______ the window ? –No, not at all .Do please .[