Hearing the director’s “       !”，all the actors and actresses kept in the own position (位置) and waited carefully．

—What’s your favorite ________? —It’s science.

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

---- Don’t jump the ______. Go and wait your _____, please. ---- Oh, I’m sorry. 

We usually take a shower in the _________.