The competition between the two restaurants was______.

 Besides being able to walk on for three days without drinking, camels can also live for a long time ______ small quantities of food. 

The country has been ______ war with its neighbor for almost ten years.

(2014·山东实验中学二模)—May I trouble you with the question?—Sorry，but it is________my knowledge.

Before selecting the curtain for your newly-decorated house，it’s important to know what colors look great _______ the wall paper．