填空题 I am writing this letter to (1)____________ ____________the poor quality of the mobile phone that I bought in your store on 10th May. ... I would grateful if you can (2)____________ it with a higher quality one or (3)____________ it for me as soon as possible. 我现在给您写信是为了投诉劣质手机,这部手机是于5月10日在贵商店购买的. ...... 我很希望你能尽快地帮我退换一台质量更好的手机或者退款