The government has been accused of not responding ______ to the needs of the homeless.

Though brought up in Los Angeles, Steven Davidson spent his whole life      in New York．

Our bodies are strengthened by taking exercise．_______ our minds are developed by learning．

When we think of communication , we _________ think of using words---- talking face to face, writing messages, and so on .

It was ________ that the tourists wanted to spend more time taking pictures outdoors.