15. The fact 　　　　he can’t speak English is still unknown to many people.

　 　 A. how　　　　 　　 B. that　　　　　　　 C. why　　　　 　　 D. when

14. His letter 　　　　the days when we worked together in the factory fifteen years ago.

　 　 A. remains　　 　　 B. remembers　　　　 C. calls up　　　 　　　 D. reminds

13. The teachers in the school wanted the building 　　　in a way to look unnatural.

　 　 A. constructed　 　 B. construct　 　　 C. to constructed　 　　 D. constructing　

12. Generally speaking, experienced editors and reporters make 　　　　　decisions about what events to report and how to report them.

　 　 A. informing　　 　　 B. inform　　　　 　　　 C. informed　 　　 D. to inform

11. The scientist 　　　　　the movement of that object for many years and predicted

that it would return every 76 years.

　 　 A. observed　 　　　　　　　　　　 B. recorded　　 　 C. learnt　　 　　　　　　　 D. found