根椐汉语意思完成下列句子。

1. In the end, ________ ________ (多于) fifty friends of his came to his party.

2. A lot of rich land has changed into desert because people have ________ ________ (砍倒) too

     many trees.

3. ________ ________ (到目前为止), our government has carried out one-child policy to control

     the population.

4. Great changes have ________ ________ (发生) in our city.

5. ________ ________ (多亏了) the help of Li Ming, Lucy found her way at last.

已知关于x的一元二次方程x²-m=2x有两个不相等的实数根，则m的取值范围是（），若m=3，则解方程得，x=（）。