1 . In another letter, Father Christmas c ______ about how he could not stop his helpers playing games with the toys instead of wrapping them up.
在另一封信中，圣诞老人抱怨说，他那些助手们非但没有把玩具包装起来，反而拿着玩具玩起了游戏，他怎么也没法让他们停下来。

2 . 我写这封信是为了投诉我前几天不愉快的网上购物经历。
I’m writing to _________ about the unpleasant online shopping experience the other day.

3 . As a matter of fact, you are not the first person ______（抱怨） the traffic jam in our city. （根据汉语提示完成句子）