右边漫画给我们的启示是（）

①北魏建立

②迁都洛阳

③统一黄河流域

④北魏分裂

被称为“地球之肺”的生态系统是____．

从方框中选择是党的动词并用其适当形式填空。有的需要加助动词或不定式符号（每次先用一次）

                                                                       A Thanks-giving Campaign Day
    Today, we had a thanks-giving campaign day in our school with a lot of activities. In the morning, I made some thank-you cards and they ____to my teachers after class. The teachers were very happy to get them. From 3: 00 to 4:00 p. m, I joined in a speech contest. In it, I ____  a thank-you letter to Mum and Dad. After I came back home in the evening, I helped my parents ____ the room and cook supper.
    I had such a meaningful day today. I realize that my parents and teachers and many others ____ a lot for me now. I must thank them by ____ harder and becoming a useful person in the future.