Tìm lỗi sai: How depth in the sea? It is five meters in depth

Tìm lỗi sai. 
 1. How depth in the sea? It is five meters in depth 
  2. How age are you? I am twelve years old.
  3. How long is it from Ha Noi to Hung Yen? It is 60 kilometers 
   4. What is the long of Hong river?