用适当的介词填空。
1. I was invited _______ Mary's birthday party last week.
2. If you want to go to another country, you should first know _______ the country.
3. There's no similar expression _______ "manman chi" _______ English.
4. _______ the start of a meal, the Chinese like to ask the guest to eat well.
5. Soup is usually eaten _______ a spoon.