综合填空。（10分）根据短文内容，用所给单词的适当形式填空。 live,  develop,  spend,  by，poor In the past, China was very 小题1: . It has developed more quickly in recent years. With the 小题2: of China, what changes will take place 小题3: 2050? Now we have some modern factories. They can produce products with high quality(质量). And some people are looking for better ways 小题4: free time. They want 小题5: a happy life. So catching up with the changes of the world is a great challenge for the young people.