Сделать вопросительное предложение: last weekend he worked hard at his report (did)

Did he work hard at his report last week?

Did he work hard at his report last week or a month ago?

What did he work hard last week at?

What did he do last week?

How did he work at his report last week?

When did he work hard at his report?

Who worked hard at his report last week?

He worked hard at his report last week, didn\'t he?