1 . I had ________ (投诉) to the manager about our rooms but I didn’t get any satisfactory response. (根据汉语提示单词拼写)

2 . An insurance salesman who is about to reach his annual sales target, only for the company to make the target higher, could rightly c________ about the company moving the goalposts. (根据首字母单词拼写)

3 . He c__________________ to the hotel manager about the cold meal. (根据首字母单词拼写)

4 . He ______(抱怨)bitterly that he had been unfairly treated. (根据汉语提示单词拼写)