Поставить предложения в past perfect i couldn't answer the question she was hungry my mother worried they were late the boy was pleased he arrived at john's the house

I couldn't answer the question because i hadn't read this theme
she was hungry because she hadn't eaten
my mother worried because i hadn't answered her telephone call.
They were late because they had missed the bus.
The boy was pleased because he had won tennis tournament
He arrived at John's house because he had had problems to decide with John.