15. I have studied electronic piano for five years, and I have obtained the certificate of Grade 1 examination. Due to the intense study during this period, I didn't practice for two months, and when I played the piano again, I was not very skilled. My father told me, "Although you have obtained the certificate of Level 1 for electronic organ, you are not specialized in science, and there is no end to learning. In the future, you still have to squeeze out some time to practice every day, so as to maintain your level." (Proverbs)
16. Xiaoming always procrastinates, and his homework is often not finished on time. The classmates reminded him that he always dismissed it: "Today has passed, and there is still tomorrow!" " When the teacher heard this, he said to him earnestly, "I hope you can seize today's time in the future. Today is fleeting, because I will live tomorrow and everything will be over."
18. In order to welcome the arrival of the New Year, many shopping malls cut prices one after another. When my mother saw it, she rushed to snap it up and persuaded her neighbor's aunt: "There is no boat ride after Suzhou (after this village, there is no such store). Go and buy it, there will be nothing so cheap after this time! "
19. Sisi is always quick to read. The teacher said to him, "learning without thinking is useless, and thinking without learning is dangerous." You have to think while watching, and chew carefully what is written in the article. "