17．One day Mary was busy working in her office in London （1）
she received an E-mail from her friend Joan．In Joan's e-mail，she persuaded Mary （2）
（look） for a flat in London for her．As she had （3）
（little） money at her command than before，the flat had to be cheap，but it had to be modern，with elevators，gas lines．It had to be in the （4）
（east） part of London，with subway stations nearby．Though Mary found （5）
difficult to find such a flat，she still went from one block to another，looking for a flat （6）
would meet Joan's requirements．Having tried too many times，Mary met her boss and politely asked him（7）
advice．It was the first time that she （8）
（talk） with his boss about her personal problems．It happened that the boss just had such a flat for rent，so they quickly reached （9）
agreement．But to her surprise，when she e-mailed Joan，Joan said that she had changed （10）
mind---she was not returning to London．
