If you don't understand the new vocabulary you could ask your teacher to explain it or, ______ , you could look it up in a dictionary.

单项选择题The large crowds lingering in the streets were quickly ______ by heavy rain.

单项选择题Regional unemployment and regional recession are an economic loss to the whole nation and they cannot ______ themselves on their own.

单项选择题Despite all the policeman's questions the lady continued to ______ that she was innocent.

单项选择题Hardly a week goes by without some advance in technology that would have seemed ______ 50 years ago.

单项选择题Anyone who can study abroad is fortunate; but, of course, it is not easy to make the ______ from one culture to another.