I won’t give in ________ great difficulties I come across in my life.

When they met ten years later, they talked happily about the people and the things ________ they remembered on the school football team.

--- Did Peter come back early last night? --- Yes. It was not yet eight o’clock _________ he arrived home.

 ____ puzzled the mother most was ____the son would never agree with her.

 If we don’t save energy, it _____ some day.