Zheng says that the most dangerous thing about a credit card is____ a person isn’t always aware of the fact____ he’s spending money.
_____ surprised me most was to see so many people waiting for my arrival.
--- Why did you call the police? --- I got home and found my house _____.
The government has taken some measures to prevent more trees from _____.
Susan, _____ university student from Europe, teaches me _____ art in her spare time.
It was the first time Mary _____ such a big opening ceremony.