I did my homework at Miss Chen's home last night.
(1)用at 9：00 last night改写
I _was___ __doing__ my homework (at Miss Chen's home) at 9:00 last night.
(2)把（1）改成否定句
I _didn't___ __do__ my homework at Miss Chen's home at 9:00 last night.
（3）把（1）改成一般疑问句做肯定回答
__Did__ you _do___ your homework at Miss Chen's home at 9:00 last night? Yes, I _did__.
（4）对（1）括号部分提问
__Where__ __did__ you __do__ your homework at 9:00 last night?