Dan Robinson has been worried all week. Last Tuesday he received a letter from the local police（当地警察局）. In the letter he was asked to call at the station. Dan wondered why he was wanted by the police, but he went to the station yesterday and now he is not worried any more. At the station, he was told by a smiling policeman （面带微笑的警察）that his bicycle had been found. Five days ago, the policeman told him, the bicycle was picked up in a small village four hundred miles away. It is now being sent to his home by train. Dan was most surprised when he heard the news. He was amused too, because he never expected the bicycle to be found. It was stolen twenty years ago when Dan was a boy of fifteen !
She appears to be worried by/about something 好像有什么事使她发愁
She wondered who that man was .她想知道那个人是谁。
She wondered what had happened.她想知道到底发生了什么。
1.call at 表示对 （某个人家或地方）进行短暂访问
He calls at every house in the street once a month.
He was asked to call at the police station. 他被告知要去警察局一趟。
2.call on 表示拜访，探望
Have you called on George recently? 你最近去看过乔治吗？
3.call out 表示大声叫喊
Some people on the bank 岸(shore) called out to the man in the boat.
Jane called me up the other day. 前几天，简给我打过电话。
If you want my help, just call up. 如果你需要我的帮忙，给我打个电话。
5 call off 表示取消
For some reason,they have called off the party /the meeting.
Want 用于被动语态时可以表示 想与（某人见面，谈话等）或者 “缉拿，追捕”
Dan wondered why he was wanted by the police. 丹奇怪警察为什么找他。
Please wait a minute， I’m wanted on the phone. 请稍等一下 有我的电话。
This is the man who is wanted by the police. 这就是在追捕的那个人。
pick up 的含义之一有 （偶然的，无意的）获得，找到，学会。
I’ve picked up a bad cold. 我得了重感冒。
I picked up some French while travelling in Paris. 在巴黎游玩期间我学了几句法语。
He picked up the book in a small library 他在小图书馆发现了那本书