A. when booked

　　B. when to book

　　C. when booking

　　D. when books

　　14. (2017·柳州模拟)As we all know, he has regretted wasting the precious time _______ he should have studied hard playing computer games at school.

　　A. where

　　B. that

　　C. on which

　　D. when

　　15. (2017·唐山模拟)Mary seems　the bad news, for she looks nice and happy.

　　A. not to have learned

　　B. not to be hearing

　　C. not having learned

　　D. not to be heard

　　Ⅱ. 阅读理解

　　(原创)CHANGCHUN—A pair of endangered Amur leopards(远东豹)have been spotted in the northeastern Chinese Province of Jilin. It is the first time that field cameras have caught two Amur leopards at the same time in Jilin, home to a quarter of all the rarest cats in the world.

　　One of the reasons for the sighting is an improved habitat for the animals, which are at high risk of extinction. China established a nature reserve in Hunchun in 2011 to protect Far Eastern big cats like Amur leopards and Siberian tigers.

　　On Tuesday, Lang Jianmin, education director with the animal conservation bureau in the forest-clad Hunchun City, said, “The two leopards, a male and a female, are very much like lovers. ”

　　Lang said the film of the leopards, side by side, was taken on November 16. “We’ve hardly seen pictures like these. Amur leopards do not live together unless they are mating. And the honeymoon, once every three years, lasts only about a week, ”Lang added.

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