OPT: --playing hide-and-seek; --playing yo-yo; --is sitting and watching the children; --is singing;
Q: Read the following article and answer the question. Article: This is a beautiful park near my home. People like to go to the park after work. Some of them go to the park every day. Look! This is Mr. Smith. He is sitting on a chair and watching the children. Some children are playing the game of _ . Some boys are playing yo-yo. Lucy and Lily are standing under a tree. They are talking. There is a small river in the park. We can see some boats in the river. Some children are sitting in the boats with their fathers and mothers. Listen! A lot of birds are singing in the trees. This is really a nice park. I come here to read English after school every day. Question: Mr. Smith is _ . Answer:
A:
is sitting and watching the children