根据材料内容及首字母提示填空，使材料通顺、意思完整。

    Mrs Marks bought a printer(打印机)yesterday．She was h____because she could print anything she wanted at any time．H____，after about an hour,she was angry because she couldn't print the colour blue．All the other c____printed fine，except blue，which was very unusual．

    She d____to call the after-sales service department(售后服务部)to help her solve the problem．David answered the phone．He t____everything he could think of to help Mrs Marks．He asked her to reinstall(重新安装)the programme，to reboot(重新启动)the computer and to turn the printer on and off. N____of these things helped．

    After hours of trying the problem s____wasn't solved．Finally,David asked Mrs Marks if he could go to her h____and try to solve the problem in person．Mrs Marks agreed，and t____him her address(地址)．When he arrived at her house,she showed him her computer and the printer．David u____what the problem was right away.He told her，"From now on，print on white paper instead of blue!"