完形填空。 Swimming is very popular in summer. People like swimming in summer because water makes people 1 cool. If you like swimming and swim in 2 place, it may not be safe. These years more than ten thousand people died while they were enjoying 3 in the water, and most of them were students. But some people are still not 4 in swimming. They often think they swim so 5 that nothing can 6 to them in water. Summer is here again. If you go swimming in summer, don't forget that better 7 have died in water. They died because they were not careful, not because they could not 8 . So don't get into water when you are 9 . If there is a 'No swimming' sign, don't get into water, 10 . If you remember these, swimming will be safe. (     )1.A. take (     )2.A. wrong (     )3.A. it (     )4.A. used (     )5.A. good (     )6.A. happen (     )7.A. players (     )8.A. swim (     )9.A. sad (     )10.A. either B. enjoy B. high B. them B. careful B. well B. come B. swimmers B. see B. happy B. neither C. feel C. low C. themselves C. careless C. best C. go C. students C. leave C. alone C. suddenly