( )1. A. few ( )2. A. if ( )3. A. energy ( )4. A. allow ( )5. A. the same ( )6. A. know ( )7. A. troubles ( )8. A. buy ( )9. A. attract ( )10.A. Millions | B. a few B. unless B. time B. make B. same B. understand B. changes B. sold B. afford B. Millions of | C. no C. because C. countries C. allows C. one C. find C. challenges C. finish C. train C. More than ten millions of | D. many D. though D. places D. makes D. different D. meet D. accidents D. build D. choose D. More than ten million of |