句型转换， 根据要求完成句子。
1. It is so hard that I can't understand the sentence. (改为同义句)
It's _____ _____ _____ me _____ _____ the sentence.
2. She is afraid of going out at night. (改为同义句)
She is afraid _____ _____ out at night.
3. The best way is to use grammar in original sentences. (对画线部分提问)
_____ _____ the best way?
4. He walked so fast that I couldn't follow him. (改为同义句)
He walked _____ fast _____ _____ _____ _____ him.
5. We can't decide when we should go to work. (改为同义句)
We can't decide _____ _____ go to work.
6. My father impressed on me the importance of work. (改为同义句)
My father _____ me _____ the importance of work.
7. To learn English well is important. (改为同义句)
_____ _____ important _____ _____ English well.
8. She sometimes watches English movies. (对画线部分提问)
_____ _____ _____ she watch English movies?
的根的个数为( )．
，有x≥2，即方程可化简为
=x，x=3，选(D)．