What movie has this sentence been taken from? Comment below (if you know it).

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I'm wondering what's the difference between "be confident in oneself" and "be confident about oneself".I was told that I should say"there is no need to feel upset and discouraged when we are faced with failures.What is the most important is that we should be confident about ourselves."But I'm so confused that I don't understand why we must use "about" instead of "in".(>﹏<)

Today when I gave my students the class, I asked them to recite the translation of a very famous Chinese poem. At first, they thought it too difficult and reluctant to do it. I helped them to understand the poem sentence by sentence and recite sentence by sentence. In the end, most students participated actively and managed to recite the poem, which gave them a feeling of fulfillment. So I think it’s important for the teacher to figure out ways to let the students experience feelings of fulfillment. This in return will encourage them to work harder.

Today, I experienced the first earthquake in my life on this rainy day. At that point, I was watching TV in the living room. Suddenly, I heard the door chugging, as if someone was shaking it with a strange beat. My immediate reaction was: is that door haunted? Before I could cry out, everything started to vibrate. My butt rocked from side to side in my chair while the cinderella above was swinging. I thought I was fainting and all these were not real. In less than a minute, everything went back to normal, as if nothing had happened. Later, it was confirmed an earthquake on the news.

I played the flute today. These days, I restart practicing the flute so that I’m going to give a performance in the concert. Although I retired from brass band club, I’d like to keep practicing the flute. To create music is very wonderful. Music always makes me happy.

Which one is correct? He does his homework before going to bed__________school nights. A. for B. in C. on D. at I suppose C is correct, thank you so much for your help.