根据首字母和所给英文释义，填写单词。

1. r_____ : a competition in speed (速度)

2. o_____: to do what a law or a rule says

3. a_____: to be successful in doing or finishing something by trying hard

4. i _____: the quality of being very important

5. s_____: to gain sth or reach an aim

要从日本运送一批海鲜去香港，应该选择哪一种运输方式（）

A.水路 

B.公路 

C.航空 

D.铁路