下列多项式因式分解错误的是（　　）

如图小方格都是边长为1的正方形,则四边形ABCD的面积是 (  )

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如图所示人的必尿系统，箭头表示流向，比较1、2、3结构内尿素的浓度，从高到低的正确顺序是（　　）

根据句意及汉语提示，写出各单词的正确形式。
⑴We'll have to____ （训练）before the next match.
⑵Our teachers often ____  (鼓励)students to ask questions in class.
⑶The girl ____  (尖叫) when she saw the snake.
⑷The old man is very sick. He takes a lot of ____  (药) every day.
⑸____  (令人伤心地), many people still don’t want to take any actions to protect the animals.
⑹It is really ____ (幸运的) for me to pass the driving exam .
⑺ Millie didn't clean the room last week, she visited her friends____  (代替).