9. I most want to go to see the Lushan waterfall.
我最想看庐山瀑布。
还能这样说：
I am eager to see the Lushan waterfall.
I desire to appreciate the Lushan waterfall.
应用解析：
see far and wide 高瞻远瞩；
see the sights of Suzhou 游览苏州名胜；
see dimly 朦胧地看见
10. The apple tree is flooded with red apples.
苹果树上结满了红苹果。
还能这样说：
The apple tree bears lots of red apples.
Numerous red apples are in the tree.
成语：
Throw away the apple because of the core.
因噎废食。
11. A colorful rainbow came out after the rain.
雨后出现一道彩虹。
还能这样说：
There appeared a colorful rainbow after the rain.
A colorful rainbow turned out after the rain.
应用解析：
all the colors of the rainbow （像彩虹般的）绚丽多彩；
chase (after) rainbows 追彩虹（意指因追求不可能实现的梦而虚度很多时间）
12. In my opinion, natural landscape is more fascinating than manmade one.
我认为自然美景比人工造景更吸引人。
还能这样说：
I would say manmade landscape is less attractive than the natural one.
I think natural scenery catches more people's eyes.
应用解析：
air one's opinions 公开发表意见；
have a good opinion of oneself 自视甚高；自信；自高自大