完形填空。 Swimming is very popular in summer. People like swimming in summer because water makes them 1 cool. If you like swimming but swim in a 2_ place, it may not safe. These years, more than ten people 3 while they were enjoying themselves in the water and _4 _ of them were students. But some people are _ 5 not careful in swimming.They often think they swim so 6 that nothing can happen to them in water. Summer is here again. If you go swimming in summer, don't forget _7 better swimmers have died in water.They died because they were not careful,not because they 8 swim. So don't get into water when you are alone 9 there is a 'No swimming' sign, don't get into water, 10  . If you remember these, swimming will be safer. (     )1. A. felt (     )2. A. difficult (     )3. A. died (     )4. A. much (     )5. A. yet (     )6. A. fast (     )7. A. what (     )8. A. couldn't (     )9. A. Because (     )10. A. either B. feel B. small B. die B. most B. already B. often B. that B. wouldn't B. Though B. nor C. feeling C. right C. have died C. lot C. still C. well C. which C. needn't C. Whether C. also D. to feel D. wrong D. will die D. more D. even D. hard D. who D. mustn't D. If D. too