1 . A simple and common method used by many consumers is to ________ (抱怨；投诉) directly to the store manager. （根据汉语提示单词拼写）

2 . Is it the ache you feel when you watch your son or daughter ___________ (消失) down the street, walking to school alone for the very first time? (根据汉语提示单词拼写)

3 . It is likely to be hard to ______ (说服，劝说) mainstream investors to put money into something so new and with such uncertain returns. (根据汉语提示单词拼写)