题目

Every weekend, my father would go to the park to feed the homeless. I really didn't understand my father's _______ into it. But I was glad I didn't have to _______ him, because I knew how much trouble my father had just getting everything ready.Then, one Friday night I was _______ a whole wonderful weekend by myself again when my dad came in.I need your help tomorrow. Some _______ won't make it.”“Dad. I can't. I _______, but failed.When we arrived, people were already there _______ us. I was _______ that my dad knew most of them by name and even what each one needed. While my father was fe设函数f（x）=sinx-cosx+x+1，0＜x＜2π，求函数f（x）的单调区间与极值．