—Was it in Shanghai, where the World Expo 2010 was held ______ you met Helen?—Yes. We hadn’t seen each other for about 5 years.
That is the day ________ I'll never forget.
Do you know the year ________ the Chinese Communist Party was founded?
This is the hotel ________ last month.
Do you know the man ________?
The place ________ interested me most was the Children's Palace.