_________ the road round to the right, the blind man asked a boy to guide him.

---Now more and more Chinese senior students are applying for admission to American universities through SAT.
---________. But taking an SAT may cost one more than 10,000 yuan.

解关于x的方程 $\frac{x-3}{x-1}=\frac{m}{x-1}$ 产生增根，则常数m的值等于（  ）

下列各句中没有语病的一句是（    ）

用双氧水制取氧气时，错把氧化铜当二氧化锰混入，其结果是（　　）