Little joy can equal __________ of a surprising ending when you read stories.

We won’t forget the financial crisis and the troubles _______ has caused to the people all over the world．

---Is there anything I can do for you? ---I’m looking for a book,      written by Han Han.

Many people have been ill with a strange disease these days, _______ we’d never heard of before.

He has evidence to prove that he was at ______ place at the time of the crime.