There are many ways a foreign language well. I think _____it is the best way. A. to learn; use B. of learn; to use C. to learn; using
The rivers in Changshun are clearer than _____ in Wuhan..
—Does your father still smoke? —No, he has succeeded in_____ smoking for three years.
I think that you have made rapid _____ in math.
I find _______necessary to do everything we can ____________protect the environment.
Sam didn't go to school yesterday , did he? ____ .He was ill yesterday. A. Yes, he did B. Yes, he didn’t C. No, he didn’t