_______ a satisfactory operation, the patient recovered from illness very quickly.
I asked her _____ have to study before I could go to university.
_____ 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.