通读下面短文，掌握其大意，然后在每小题所给的四个选项中，选出一个最佳答案。
It's a fine Saturday morning. There are many people in the park. Many of 1 are young and some are old.
Some children are 2 games over there. Two boys are playing 3 their toy bats. There is a lake in the park. The water is 4 . There are some 5 on the lake. 6 the lake a young man is reading. There is a house near the lake. Beside 7 house two men are working. Look at that big tree! There are some birds 8 it. Under it are some men. Four of them are playing cards. One of them is looking at two cats. The cats are 9 up the tree. What do they 10 to do? They want to catch the birds.
