某工厂十月份生产机器420台，九月份生产的台数是十月份的 $\frac{9}{10}$ ，又是十一月份生产台数的 $\frac{7}{11}$ ，十一月份生产机器多少台？

I spend an hour____ (do) my homework in the evening.

关于产生感应电流的条件，下列说法正确的是              （）        

    I'm an Chinese girl. My name is Rose. I have a brother. His name is Tom. Tom and I are in the same school. I often go to school by bike. Tom usually⑴w__________ to school. We both(两个都) have lunch at school and we like Chinese food very much. After school， Tom always plays basketball with his classmates. ②I always speak Chinese because I like Chinese best. I go home at about five o'clock in the afternoon. But Tom goes home late， at about a quarter past seven. My parents are both teachers. They teach for many years in Beijing. We like China very much.