单项选择题The air of countryside is cleaner than ______ of city, but I don't like to live ______ far.
单项选择题We()on this project for four hours. Let's have a rest.
A. are working B. have been working C. worked D. had worked
单项选择题I'm tired out. I ______ all afternoon and I don't seem to have finished anything.
单项选择题This area of the park has been specially ______ for children, but accompanying adults are also welcome.
单项选择题One of the few things you say about English people with certainty is that they ______ talk a lot about the weather.