I have two good friends, Betty and Max. Betty is very slim and she has long hair in 1 ponytail. She is helpful and ready 2 anyone any time. On the bus, she always gives up her seat to someone in need. She often helps me 3 my schoolwork when I need help. She is also trustworthy. When something 4 me, I always go to her. She is patient enough to listen to my problems. When I am down, she knows the way 5 me up.
Max is a boy with small round glasses. They make him look a little 6. He has a sense of humour and enjoys telling interesting 7, so I never feel bored with him. He is always full 8 energy. He stays active when doing sports and doing club activities. He never gets tired. He is also a 9 person. He always encourages me to keep 10. I think we can be good friends for life.

( )1. What does the first paragraph mainly tell us?
A. The reason for smiling back. B. An opinion on smiling back.
C. The result of smiling back. D. An example of smiling back.
( )2. Why do we smile back when we see someone else smile?
A. Because we want to talk with the person.
B. Because we are feeling the person's joy.
C. Because we want the person to understand us.
D. Because we want to show we are clever.
( )3. What problems do people with some diseases have?
A. They can't feel happy when others smile at them.
B. They smile too much and can't stop.
C. They can't copy others' smiles.
D. They never smile and they are unhappy.
( )4. Which could be the best title for this passage?
A. Why is smiling contagious? B. What's World Smile Day?
C. Why should we smile? D. Do you know how to smile?