I often see Tom       on the playground. When I passed the playground yesterday, I saw him      .

                A. play; playing           B. to play; play            C. playing; to play           C. playing; play

Bill likes tennis very much. I often see him        tennis with his friends.
A．play                B．to play              C．playing

I often see the girls ________ in the room. They are very pleased.

A. dance     B. dances   C. dancing   D. to dance

When I was eleven years old, God gave me a gift of happiness. One day, on my way home from school, a truck ran over me and cut off my      1   . As I lay there bleeding, I realized that I might have to live the rest of my life     2    legs. How depressing（令人沮丧的）!      3     then I realized that depression won’t get my legs back. So I decided not to      4    my life feeling depressed. When my parents arrived at the     5  , they were shocked and sad. I told them, “I’ve already    6     the fact. Now you also have to get used to this.”
Ever since then, I often see my friends getting     7     about little things: their bus comes late; they get a bad grade on a test. But I just   8    life.
I was lucky to realize that it is a waste of energy to focus on what you have     9   , and that the key to happiness is to take pleasure in what you have. Sounds simple, doesn’t it? So      10 are many people unhappy?
People often think happiness is based on what you     11  . “My whole life would improve if I had a new car.” But when you get the    12    and what happens? For a whole week you are walking on air. Then you go right back to being     13   .
Happiness is not a happening; it’s a state of     14  . You can have whatever there is in the world  and  still  be  uncomfortable.  Or  you  can  have  relatively     15   and  feel  full  of  joy. Happiness comes from mastering the art of appreciating and consciously taking pleasure in what you already have.