读下面一段短文，用括号内所给单词的适当形式填空。

       A young woman was waiting at the airport. She bought a packet of cookies. She sat down and

started   1   (read) the book. Later, a man sat down next to her. When the woman took the   2   (one)

cookie, the man took one, too. She was really surprised but said   3   (something)."Why is he eating my

cookies?"She thought.

       Every time she took a cookie, the man took one, too. Then there was only one cookie left in the

packet. The man picked the last one up, divided (分) it in half,   4   (give) her a half and left the waiting

room. She got very angry.

       When she got on the plane, she found that there   5   (be) a packet of cookies in her handbag. It

was never opened.

布置城市排水工程系统时应考虑的要素？