It will not be long _____man can harness the solar energy and make it serve mankind.
--- You should have thanked her before you left. --- I meant , but when I was leaving I couldn’t find her anywhere.
--- Who has been planning the summer camp? --- Everyone in the class .
--- Everyone says you are a good employee. You never make a mistake, do you? --- .
--- Have you found the dog? --- No, but.
--- Have you been here long? --- .