Only after he was brought to the police station did the young man ________ he had stolen some purses from other passengers.

Corruption is _______ problem in countries across the world, with developing countries often believed to be more serious, although there is no evidence to suggest this is _______case. 

(2013·陕西，25)My uncle hasn't been able to quit smoking，but at least he has ________.

Before writing your answer, please give careful __ to the question．

——Recent years have________ rapid changes of my hometown.——Yes, I could hardly recognize it when I arrived yesterday.