— How long is it _____ you picked up your badminton training? — It was not until my finance became better in last December _____ I started the training.

It was with great joy       the couple found their missing son after 18 years.

It was in the street where a serious accident happened last week ______another happened yesterday.

— Why didn’t they complete the task in time?— Because it was not until late afternoon _____ they began to solve the major problem．

 It is _____ we do ---- you and I ____ changes the world.