It's a fine Sunday morning. There  16  many children in the park. They are  17 happily. Some are playing  18  under a big tree. Some girls are singing and  19  . Some boys are running  20  the hill. Li Lei's  21  by the lake.  He's reading a story.  22  is Wang Lin?  He's standing over there.  23 is he doing?  He's looking  24  a nice butterfly(蝴蝶). He 25 to catch it.

(  )16. A. is            B. are            C. am                       

(  )17. A. playing       B. sing            C. dance

(  )18. A. yo-yos        B. the football      C. games           

(  )19.A. dancing       B. to dance         C. dance

(  )20. A. on           B. up              C. about              

(  )21. A. sitting        B. sit              C. siting

(  )22. A. What        B. Who             C. Where              

(  )23. A. Where       B. What            C. Who

(  )24. A. at           B. after            C. for                 

(  )25. A. want         B. is wanting       C. wants