从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. —Look! You look so tired after you have climbed that high mountain, but why?
—_____ the beautiful scenery at the top of it.
A. See B. To see C. Seeing D. For seen
2. Generally speaking, the electric bike is not dangerous as _____, if _____ according to the instructions.
A. reported; ridden B. reported; riding
C. report; to ride D. reporting; to be ridden
