________ Miss Gao's help, Meimei learns English well.
用配方法解方程x2﹣2x﹣1=0时,配方后得的方程为( )
When I see too much water ________ in our school every day, I feel very angry.
某历史学习小组围绕西藏和平解放、土地改革、抗美援朝进行研究性学习。该小组研究的主题就是( )