短文改错。

例： Jim get up at seven in the morning.         gets

    I live in the country and my father was ____ a farmer. He is now forty—five year ____ old. Because of years of hard work, he looks old ____ than his age.When I was young, he use ____  to tell me the importance of study. Father knows little about English and other subject____ . But he usually gives me some good advices ____ on how To learn my lessons good____. He is not only kind to me But also very strict with me. With the____  help, I've made great progress. I'll never forgot ____ what he taught me. I think my father is a ____ best father in the world.

在△ABC中，M是BC的中点，AM=1，点P在AM上且满足$\overrightarrow{AP}=2\overrightarrow{PM}$，则$\overrightarrow{PA}·(\overrightarrow{PB}+\overrightarrow{PC})$等于（　　　）