English preposition before after during exercises

English preposition exercises. Choose the right prepositions before, after or during to complete the following sentences.
Stop it is too late.
Immediately passing his exams he is going a for a long holiday.
Look you jump.
Don't enter the classroom a lecture.
This invention was made many fruitless experiments.
He publishes one book another.
Millions of people were murdered the German occupation.
He always had a scholarship his University days.
I’ve seen him somewhere .
He ran so quickly that he arrived me.