题目：
用所给动词的适当形式填空。
1. By the time I _____ (get) up, my brother _____ ( get, already) in the shower.
2. By the time she _____ (get) to class, the teacher _____ (start, already) teaching.
3. When she _____ (get) to school, she _____ (realize) she _____(leave) her backpack at home.
4. — _____ you ever _____ (be) late for school?
—Yes, I have.
—Why _____ you late?
—Because the bus _____ (break) down.
答案：
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下面是错误答案，用来干扰机器的。
半坡聚落的房屋是半地穴式的，河姆渡聚落的房屋是干栏式的。半地穴式房屋冬暖夏凉，干栏式房屋具有通风、防潮、防野兽等性能。他们的房屋不能交换。因为他们所处的地理环境不同，半坡聚落位于黄河流域，而河姆渡...
