来自《摩登家庭》：She had a girl on who, at 16, found out that she was adopted and felt betrayed, ran away, and became a stripper, and not the heart-of-gold kind, the by-the-airport kind.请问这里的on是什么意思？百思不得其解，不知道是字幕有误还是有另外的意思...
...位老师，在这句话中：They can pursue their hobbies and take lessons _______ swimming, martial arts or calligraphy as well.A. on B. in C. of这里的介词选哪个呢？答案给的是on，但我查到也有用in的例子，请问各位老师这里用in和on是否都可以，谢谢...
...真题做了一下，也发现有不少疑问：Leslie Nielsen’s devotion to acting is wonderfully
inspiring. He built a hugely successful career with little more than plain old
hard work and determination. He showed us that even a single desire, never
given up on, can make for a remarkable life....
They agreed to share the remuneration. (1)They agreed on sharing the remuneration. (2)句子（2）中的动名词sharing前面为什么加介词on,去掉介词on可以吗？这说明句子（2）中的agreed是不及物的吧？ 谢谢老师的解答。
通常看到的是 at Christmas 和 on Christmas Day。如：At Christmas, she received many gifts. 圣诞节她收到了许多礼物。The whole family descended on us at Christmas. 圣诞时节，全家突然来拜访我们。Business is good at Christmas when people buy presents. 圣诞节人们...
这是新概念3里的一句：
The village seemed deserted, the only sign of life being an ugly-looking black goat tied to a tree on a short length of rope in a field nearby.
这里面的 on 是什么意思？是表示“依附”“固定在……上”？
The dreamy Meridian Club on its own 800-acre plot called Pine Cay boasts some of the prettiest stretches of sand in the Caribbean, not to mention calm, clear waters that are ideal for snorkeling and diving.介词on引起的短语与被修饰词是怎样的关系？谢谢老师的回答。
...考英语北京卷阅读理解第C篇文章：
If you want to cut down on your spending, a good goal would be making morning coffee at home instead of going to a café, for example.
不理解句中为什么用cut down on，这个on是否是多余的呢？如果用on也可以的话，那cut...