It was ____ that she couldn’t finish it byherself

Will you give this message to Mr White, please? — Sorry, I can’t He ____ [ ]

The fireman started to put out the big fire_____ arriving at the burning building

When the teacher came in, he saw some boys _______behind Daniel, _______ the computer games.

It_____ have been Tom that parked the car here, as he is the only one with a car.