Beckham stopped playing soccer ______ his bad leg.
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 didB. Yes, he didn’tC. No, he didn’t