It is so dirty that I don’t want to live here .
He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system ____.
Computers and mobile phones, though they are indeed making our life ____ and more ____, have reduced the need for face-to-face communications.
The woman ____there under the tree, ____ in a blue shirt, is our headmaster.
The new technology, if____ to farming, will help increase the grain output.
More and more high-rise buildings have been built in big cities____ space.