It’s a good habit to turn off the unnecessary lights, it can help save       .

Dogs have a very good ______ of smell and are often used to search for survivors in the earthquake.　　　　　　　　　　　　　　　　　　　　　　　　　

—Susan ,where is your mother？— My mother is cooking in the       

The girl’s name is Maria Green, so her ___________ name is Maria.

 __________ is spoken the most widely in the world.