Act and omission together constitute a legal act. Act means that the subject should do a certain act. Omission is a legal act that is manifested in a negative manner without external actions,. Who is doing the following? ['The nurse Xiao Zhang reads the book and forgets to make a drop on A bed.', 'Xiao Huang who saw a child fall into Kunming Lake and left directly.', 'Dong, who knew that someone in the neighboring village had stolen the optical cable.', 'Duanmou puts pesticide into Wangmou chicken feed because of hatred.']