1. The manatees are about 10 feet long and they weigh about l,0000 pounds. (对画线部分提问)   
                _  _______ the manatees _______?
12.A manatee eats about 100 pounds of food a day. (对划线部分提问)  
                    _______ food does a manatee eat a day?
13. Diana is an inspiration to us all. (改为同义句)    
      Diana _______ all  _______ us．
14. Zoos are terrible places for animals to live. (改为同义句)    
      Zoos are                ________ places for animals to live.
15. They are trying to help the environment. (对画线部分提问)    
                   are they trying               _ _________?