I'm Tina, I am ____ English girl. My brother is Jim. I'm____(整洁的), but Jim isn't. In our room, my books and tapes____ (be) in the bookcase. My____ (key) is in my schoolbag. I ____ (有) a clock. It's on the desk.____(Jim) books are everywhere ----on his bed, on the sofa and under the chair. The ____(棕色)hat is ____(he). It's under the desk. “Where is my ruler? Where are my____ (字典)? Where's my schoolbag?” Jim always____ (ask).

秦皇岛属于我国四大地理区域中的北方地区，属中温带。

解方程组：$\left\{\begin{array}{c}x+y+z=26\\ x-y=1\\ 2x-y+z=18\end{array}\right.$

____

某小组的同学做“比较不同物质的吸热能力”的实验，他们使用了如图所示的装置．