—Putting on a happy face not only helps us make friends but also makes us feel better.— __________.
______ you return those books to the library immediately, you will have to pay a fine.
The teacher began by _____ us where the city was and went on ______ about its history.
Human be haviour is mostly a product of learning, ____ the behavior of animals depends mainly on instinct.
_______ from the hill, the whole city of Nanjing looks more beautiful.
____ I saw her, I remembered to give Marie the money I owed her.