Rewrite the following sentenced as required（根据所给要求，改写下列句子。每空格限填一词）

【1】The boys and girls cleaned the room after the party.（改为一般疑问句）

________ the boys and girls ________ the room after the party?

【2】Tony was reading a comic book when his mother came home.（对画线部分提问）

What ________ Tony ________ when his mother came home?

【3】The new flat cost Mr. Black a lot of money.（改为否定句）

The new flat ________ cost Mr. Black ________ money.

【4】Mr. Smith rarely talks with his son about his study.（改为反义疑问句）

Mr. Smith rarely talks with his son about his study, ________?

【5】You will fail to buy the train ticket if you don't book it online early.（保持原句意思不变）

You ________ be able to buy the train ticket ________ you book it online early.

【6】"Has Mr. Black decided on the date for the test?" the students asked.（改为宾语从句）

The students asked ________ Mr. Black ________ decided on the date for the test.

【7】is, interesting, snowman, to, it, a, very, make（连词成句）