It was at 8 o’clock ________ I went back home last night.

I _____ hope that every one of us will be successful in our studies．

It was the hurricane ______ was called Katrina ______ destroyed the city of New Orleans. 

—— ______ you got to know I traveled to the USA?——Through one of your colleagues.

It was in New Zealand ___ Elizabeth first met Mr. Smith.