How do you choose the right preposition in front of "which"? For example: 1) When Defoe was nearly sixty years old he turned to fiction and wrote the greater work by which he is remembered. (why is "by") 2)It It is sometimes said that the next best thing to eating food is talking about food. If this is true, we need the vocabulary with which to do it! ( Which stand for what? I'm confused) How do you choose the right preposition in front of "which" when you are writing or speaking? I found that it's really hard for me to make my own sentence with it even if I understand when I'm reading.

War machine? What does it mean? This is the context: Is that your ideal, tell a lie ? How could I trust you ? According to this, do you really think that you deserve a second chance ? Well, you understand nothing about the Chinese women ! Nothing ! Then she left instantly the restaurant like a war machine. Why is "war machine"? Because she leave quickly or angrily? when would you use "war machine"? Could you give me some examples? Thanks!

"for one's sake", what dose it mean? Can you give me some examples and explain them? Thanks a lot.

Trees have sentimental value for us. Today I want to talk about trees. I don’t know if people in other countries have same view but in China trees have sentimental value for us. It’s like one morning you get up early, you draw back your curtains and open your window. Your room is filled with brilliant sunshine and the tree is out there, like an angel. The fresh green jump into your sight, which will expel the last day’s unpleasant things from your mind and light the whole new day. Besides, there are other deep meanings about trees, one of my teacher has told me that a lot of Chinese people have gone abroad in the past few decades, but you can hardly find their tombs in the foreign land because they came back to their motherland when they were dying and this phenomenon is called “叶落归根”，which literally means the fallen leaves should return to their roots but now it means one’s old bones to be buried in one’s hometown. As for me, trees do have sentimental value, I want to plant a baby tree by my place, because most of trees live longer than humans. I want make the tree still being alive when I die, because may be my family and my friends will remember the time they spent with me when they see the beautiful tree.

What does it mean "get beat up"? Eg:I coundn't get beat up all by myself. Does it mean other people hit me or I hit others? I'm really confused, can you help me?

"give me a cancer" what does it mean? For example: The math matriculation exam gave me a cancer.

ignore, neglect, overlook. What's the difference between them? 1.This is the opinion of many peasant today. It would be wrong to ( )it. 2.The message was clear. While we strove for high GDP, we must not （ ）social harmony either.

A little surprise in Stressful French Class. French class is the most stressful of my all classes, because our French teacher, Mr Hu is quite strict to us, she has a bad temper but she never show it to us（but we can tell it from her expressions), To be honest, she is a good person, she works hard and always be rigorous to her work(teaching), Today we learned the location of pronoun, which were so complicate that I can't memorize all these grammar rules and organize sentence, but Mr Hu always likes give us a question after she explained a grammar rule and then calls on someone at random to answer the question in 20 seconds. How can we get the right answer in such short time? we don't even have time to ask help from others. And this time I was the bad luck man, she called on me，omg, sometimes I thought to myself why do you never call on me when I know the answer, but you always call on me when I don't, I have butterflies in my stomach at that time, so I blurted out a answer that I'm not sure at all, but guess what, my answer was quite right, I got a "tres bien", I was so excited.

There is paradise in heaven, there is Handzhou on earth. Hangzhou, or Hang for short is the capital of Zhejiang province. It located on the southeastern coast of China, the lower reaches of the Changjiang River, and the south end of Jinghang Grand canal. It is the center of politics, economy, finance and culture in Zhejiang province, one of the seven ancient capitals and the center of the important e-commerce in China. Hangzhou is famous for its beautiful sceneries, which had the good reputation of " There is paradise in heaven, there are Hangzhou on earth". There are numerous human heritages such as Xihu lake and a large of number of humanistic landscape and natural landscape around it. Hangzhou with the profound cultural accumulations is one of the birthplace of Wuyue culture. The most representative culture should be Liangzhu culture, silk culture, tea culture and some stories handed down by people.