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C. Why not
D Why bother 2. The failure was a big ______ to him, but he wasn’t discouraged and soon got as enthusiastic as ever. A. blow
B. issue
C. excuse
D. factor 3. Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours. A. likely
B. possible
C. probable
D. sure 4. Schools should be lively places where individuals are encouraged to ______ to their greatest potential A. accelerate
B. improve
C. deve
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