根据短文内容填写所缺单词或用所给单词的适当形式填空，使短文意思完整。
It's a sunny day today. My friends and I are in the park. Look! Amy is drawing 1. picture under the tree. She is very good 2. art. Mike is playing basketball with his brother. They run 3. (quick) and jump high. Sarah is sitting on the grass and 4. (read) a book. The book is 5. (her).
In the middle of the park, there is a small lake. The water is clean, 6. we often go boating there. Near the lake, there are some 7. (flower). They are red and yellow. My little sister Lily wants 8. (pick) one, but I tell her not to do that. “We should protect(保护) the plants,” I say. What am I doing? I 9. (watch) a bird in the tree. Birds are our friends. We all like 10. (they).
In the afternoon, we go home together. We have a great day!

1. a 2. at 3. quickly 4. reading 5. hers 6. so 7. flowers 8. to pick 9. am watching 10. them

我们可以结合语法规则和固定搭配逐个分析填空：
1. 空1："draw a picture"是固定搭配，意为“画一幅画”，填不定冠词a。
2. 空2："be good at"是固定短语，意为“擅长……”，填介词at。
3. 空3：此处需要副词修饰动词run，形容词quick的副词形式是quickly。
4. 空4：句子是现在进行时，and连接两个并列的动作，要和前面的sitting保持形式一致，read变为现在分词reading。
5. 空5：此处表达“这本书是她的”，后面没有接名词，要使用名词性物主代词hers。
6. 空6：前后句是因果关系：水很干净，所以我们经常在那里划船，填连词so。
7. 空7：some后接可数名词时要用复数形式，flower的复数是flowers。
8. 空8："want to do sth."是固定用法，意为“想要做某事”，填to pick。
9. 空9：问句是现在进行时，回答也要用现在进行时，主语是I，对应be动词用am，watch变为am watching。
10. 空10：动词like后面要接人称代词的宾格作宾语，they的宾格是them。