The train ________ and pulled out of the station. [ ]

I failed again in the examination and only then _____ how much time I had wasted.

Many species are in ______ danger of extinction now due to the foolish actions of ______ human race.

Did you go to the show last night?–YeahEvery boy and girl in the area _______ invited

What kind of structure is the sentence “The girl showed her classmates some of her family photos.”