Architects from around the world are answering the call and are exploring the ( ) of the eco-city.

(单选题)When he heard the knock at the door, Frank probably thought (单选题)Why did Frank dare to shout to his boss? ( ) (单选题)What do we know about Frank? ( ) (单选题)Readers did not ( ). (单选题)Doyle made up the description of Holmes ( ). (单选题)Holmes was supposed to have lived ( ). (单选题)Sherlock Holmes was ( ). (单选题)Where is the passage most probably taken from? ( ) (单选题)What is the discussion mainly about? ( ) (单选题)Who once read a newspaper out loud on a train? ( )