根据句意和汉语注释，写出单词的正确形式。
The famous actor was found ________________ (死的) at home last night.
The writer ________________ (接到，收到) thousands of letters every month in the past.
Just as the saying goes, “________________(实践，练习) makes perfect.”
We can often see signs like “No ________________ (实践，练习)” in parks.