按中文提示填写句子每空一词：
他常在周末打扫房间
He often some cleaning at the .
我想他肯定在办公室
I think he ,at the office.
爱丽斯太小了还不能上学
Alice is not ,to go to school.
这本书很有下子
The book.is very .
邮递员每天送信.
The postman ,every day.