I started to learn English when I was six. My dad gave me1advice on listening to the Beatles. I listened to them every day for the next seven years. At the beginning, I could understand2of what they sang. But soon I started to understand some of the3.

    4 I got a book with the words of all the songs. And when I had time, I would read it. I learned many songs5this book. I6the songs to myself. Still, I understood very7of the meaning. To learn English well became my8, and I wanted to learn the9of the Beatles' songs. That is how I started to learn English.

    Today, I can understand the Beatles very10. Each time I hear a Beatles' song, I am happy and proud because my dream of learning English well has come true.

烛焰通过焦距为10cm的甲凸透镜在光屏上成清晰的像，如图所示．现用焦距为5cm的乙凸透镜替换甲，不改变蜡烛和凸透镜的位置，关于乙凸透镜的成像情况，正确的说法是（  ）

Tina goes __________ after __________ school at four thirty.

函数$y=\frac{1}{2}{x}^2-\ln x$的单调递减区间为（   ）