按要求完成下列各句。
1. There is enough food. Please eat as much as possible.（改为同义句）
There is enough food. Please eat as much as__ __.
2. Tom left home two days ago.（改为同义句）
Tom has _________ home for two days.
3. His sister had already read some books before she went to school. (改为否定句）
His sister___________ books___________before she went to school.
4. I went to sleep at 9:00 last night. My father came back at 10:00 last night.（合并为一句）
I________ to sleep before my father came back last night.
5. We had learned 2，000 English words by last term.（对画线部分提问）
____ English words ________you________ by last term?
