We stood at the top of the mountain east of the city,watchin

We stood at the top of the mountain east of the city,watching ____burning sun rising.
A.不填; a B.the; a C.the; the D.不填; the
表示方位的词前面不是需要加定冠词吗?第二个空为什么要有a呢?
You can eat food free in my restaurant ______you like.A.whenever B.wherever C.whatever D.however
为什么?
第一题的第一个空在east前