49. This math exercise is too difficult for me to solve. A. I have no difficulty solving this math exercise. B. This math exercise is difficult enough for me to solve. C. This math exercise is easy enough for me to solve it. D. This math exercise isn’t easy enough for me to solve. 50. I am keen on walking in the rain. A. I avoid walking in the rain. B. Walking in the rain gives me a lot of pleasure. C. I often have to walk in the rain. D. Walking in the rain makes me feel unpleasant.

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