根据句意及首字母提示填单词，使句意完整，请注意单词的正确形式。

小题1:Tom often r_________ .his bike to go to the zoo.

小题2:Some students are playing soccer on their school p_________.

小题3:—Dou you think English is easy?

—No. I think it’s a little d_________ .

小题4:We can’t see the ball because it is b ________ the door.

小题5:It’s about 130 k_________ away from Beijing to Tianjin.

全党要充分认识这场伟大斗争的（），发扬斗争精神，提高斗争本领，不断夺取伟大斗争新胜利。

A.长期性、复杂性、艰巨性

B.长期性、系统性、复杂性

C.持续性、复杂性、整体性

D.持续性、系统性、艰巨性