阅读下面短文，在空白处填入—个适当的词，或填入括号中所给单词的正确形式。

     (I) name is Peter. I in Class Three. I like sports. I play sports every day. I can play tennis, basketball and volleyball.I can't play ping pong. Ping pong is difficult me. My sister Anna is Class One, She  (like) sports, too. She can play volleyball, tennis and ping-pong. And she plays ping pong  (good). But she can't play basketball, Anna and I have some sports(thing). Anna (have) 6 tennis balls. 7 volleyballs and 10 ping pong balls. I have 4 volleyballs, 8 tennis balls and 9  (basketball),