单项选择题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.