1 . Cycling is an excellent and c________ way to travel around the national park.(根据首字母单词拼写)

2 . We have only twenty minutes left, so please get to the point and don’t say anything that isn’t ______ to our problem.

A．relevant

B．ambitious

C．precious

D．prosperous

3 . Compared with the n________ river, the ocean is rather wide. （根据首字母单词拼写）

4 . I’d like to take this opportunity to express my h________ gratitude to you for your help when I was in difficulty. （根据首字母单词拼写）

5 . To solve this problem, it needs more open discussion and more ________ (自我批评的) thinking. （根据汉语提示单词拼写）

6 . Extra lighting would make a ________ (重要的，值得做的) contribution to road safety. (根据汉语提示单词拼写)

7 . Arthur Conan Doyle is best-known for his fictional d_________stories.（根据首字母单词拼写）